Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a3b7d4044e6f2c…

MALICIOUS

PDF

83.4 KB Created: 2021-07-19 19:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9d429ec164bf2fd4ef1c97038945a45 SHA-1: 52100f3807f02d074e213294ede4f2d6ce62d8e6 SHA-256: 97a3b7d4044e6f2c46ef9a2e372873891de1f8fe3855cb68f3daf5c71c5461a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan. The document contains numerous embedded URLs, many of which point to compromised CMS upload storage or are structured as link farms on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160758dd2849ab---renitazafowevekasarovube.pdf In PDF document text
    • http://haus-st-otmar.ch/userfiles/files/xofinofojevanojer.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb639af05---jaxabaxuwire.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b310cd8e690f9ef8fe1b8cc6581e8ac4/71521313144.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c167193e7---31841713059.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/finikefedi.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d871701e18---91855682999.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39ef078e165f72e7a2d47d2a3c02b983/78960013576.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/30879641083.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/75250631614.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/28687959836.pdfIn macro / runtime command snippet
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2308340e7554296bfb31edf50d8f79ea/fawepexoduretukegefe.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/u1fd3al0jg0i35uvm772jmldgs/kujemupanuvamofe.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/43499429ca7af69dc916e94c944a65bc/tonixuxilobu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076cee48becc---pafuwos.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/guzelusekiziku.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e06047cf3---17908176275.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608144122c8d7---69815729658.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/48665437386.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/84300145779.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f7a816226fd924efff55190b30526ba4/fiwomewapumosunokixetexig.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608780022071f---posodoj.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/82223f99bc4abd4c9c45a1662292c979/wijebirel.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1078f74e30---11386604980.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/448734a427cb447b9eaeaba600b314cf/litas.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/dujesila.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3854c19de---terorabewa.pdfIn PDF document text
    • http://vytvarnyobchod.cIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=easy+piano+tabs+for+popular+songsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10736 bytes
SHA-256: 5402932084bb85e2f3c0ba9ebeb948e2c4a160576e6bb653fdd172ed16e7864e
font_02_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 17100 bytes
SHA-256: faf9422492d344df2ee7197a6a9edfea41ddc7e86ac4599701af0201ecff12cb

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