Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad397040d37c59c5…

MALICIOUS

PDF

84.0 KB Created: 2021-08-11 13:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd3141c67e40295e54b661a1d92701dc SHA-1: 973310586a64c89a626b820fe1956a996d13b4ae SHA-256: ad397040d37c59c5fd75267339e766feb2ba65b7bde6e785c4d3e676b9ad660a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://stavebnevyrobky.sk/www/upload/files/fapepo.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/653e13c9791e774293bc3a0c0a134844/bumebemimanomukukugig.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/marafavivajusuj.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/nolagatixudolemir.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1baj15c427ji2164a2169hg71h/rajoz.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee0472rmrkfr86ppvqrerbq244/54109193734.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7f094ea71---80343484531.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f3c4ca0dda498d91b33a276c5bef6515/52464846541.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/pazawomujanasevu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/82a68d567e728437e6b0475de446fe9d/bigivegamidarabito.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/35114603553.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e34def3cecd---14282114256.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/nogasiwobob.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d13558368---19707403960.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052321595154.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/tasubiwerapudi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/24084283125.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/pokujufosudegupasolotetel.pdfIn PDF document text
    • http://tianfonmm.com/d/files/jumopumetuf.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/85814951968.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lomesujupozifefalolozefi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161136664b39a4---81998854696.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/92393662581.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/ronasovugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=kabir+singh+bekhayali+ringtone+download+pagalworldPDF 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_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 16972 bytes
SHA-256: aa924a776ccdf5ede561e2979a7e39a2a51b33905e7e398e78553062cd82bf7e
font_01_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 11096 bytes
SHA-256: ca51069d00addf3e6bcdf91e854a101e7035deec1a66cfc274ac1ef638f94367