Malicious PDF — malware analysis report

Static analysis result for SHA-256 317ac9fdd3b26bf1…

MALICIOUS

PDF

84.2 KB Created: 2021-08-17 08:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c10b4e1f577b4a93e479facb34e617f SHA-1: 7c468880038da45124825066425b4fb26ac0ec55 SHA-256: 317ac9fdd3b26bf1c587e295f3d4a85a8e3fe0719bc64ae1fc513f6da7ac8e66
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inarchengineering.it/userfiles/files/286923579.pdf In PDF document text
    • http://freeski.hu/freeski/file/91917470791.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/u0e31d45haai1vimp0g7vdfnps/lafobuwuzevesogupeval.pdfIn PDF document text
    • http://bptramptour.pl/files/file/34431455917.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbc67d93f---87272531556.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/84104647062.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e72eb56c---savepidarov.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/93035330054.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d52677dd5---vuredujurivotajuripekuvo.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/32876886293.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/b0016810b02b4fec05f13576f2f42bdd/tinapiwisomuvagezajud.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b76f2bc7---rurufafevetekowufuziwuv.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/220e26cb96e1ff54f0e2ce807987ed56/lipaveg.pdfIn PDF document text
    • http://ux-school.ru/files/files/35423155832.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/4705014954.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/34689157467.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/15397639816.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4071dd261---xudomoveme.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061813035620.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/43027502184.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/60112143866.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/kasogeb.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/nutomelujomivuzutuve.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/65447174865.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/307876cc6bdd3d2715af30b69b174e1e/tegubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pixel+car+racer+speed+hack+apkPDF 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_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 17156 bytes
SHA-256: 831047c690bb55f441a76d8766b3a31d118f584706e8924e6a90a2d700575119
font_01_sfnt_off0001125e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 10484 bytes
SHA-256: 3d5f34adc19dfb5f3edba33f808e1c0e51d4066b8fa4644324d3429c7dc78d72
font_02_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1