Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed9bc6b3c4e47bc…

MALICIOUS

PDF

91.4 KB Created: 2021-09-04 09:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f726d174ec1bfe9e0c04cf75245efb6 SHA-1: 49bb62bdc9d9acc60b00566a076a38517f6737c2 SHA-256: 1ed9bc6b3c4e47bc50b19c2e5e02d080c8adb4b338ee3a80993a0bc41e528384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and numerous external links are consistent with attempts to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7fb50adca---rezevupikupakoj.pdf In PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/welujan.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210705222603.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c18bbbbb---2104677074.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/vepajetatogivumogike.pdfIn PDF document text
    • http://cmtsport.com/pliki/75028193779.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jevodarigojojafuxe.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/gebokupa.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/44242934803.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/251eba8df611b1479632c81877abb0b7/xalejero.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/bewez.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/33233013313.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/50651541860.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/pekexi.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/valakilex.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/36256798495.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/22418845655.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/fe352eb0518419412f0272d9e3258de1/71869453853.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7p36v55vru1nlk59r00epur7b2/pisubiniterozexafux.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/96198746365.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161111565c313c---39465855381.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zofivutimo.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/badivizijinalisibewaverav.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/36065863115.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/7211924766.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c6b4d19a---jivuzalazuwuzomesax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sewage+and+sewerage+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 26248 bytes
SHA-256: d3e49f26581916deec2f35a7b2eba6a7d4e456e84cf9302753f4161465dc202c
font_01_sfnt_off000110d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 10476 bytes
SHA-256: f9a5216397ac7d5cbefd0b201687d362d8f3e39749c12481761bc36c4899e8df
font_02_sfnt_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 1956 bytes
SHA-256: a288b9263c5eab6e90fd7d2a71963d95bc4ebec1cb0ac756bc5239715d573b17
font_03_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000149a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A0 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137

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