Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd4967991913f1f…

MALICIOUS

PDF

90.0 KB Created: 2021-07-07 09:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d715709dd0769e4f4602bce2fc136999 SHA-1: 3ab552b3c7c3414165ebd0dc7f2ffdfd989285b2 SHA-256: 9dd4967991913f1f5556a244f8187bf499498bc4f4a217b84f1920919a2977f7
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including links to compromised CMS uploads and link farms on disposable hosting. Notably, it includes a 'Clipboard command execution lure' which instructs the user to copy and paste content into a shell, a common technique for executing malicious code. The ML classifier also strongly flagged this PDF as malicious. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM firings suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://martonaroniskola.net/userfiles/file/46986980498.pdf
    • http://intemhathanh.com/img_duhoc/files/gemamarudelider.pdf
    • https://nestuby.com/userfiles/file/fababegepudagalut.pdf
    • https://rubenoferro.com/userfiles/file/87878848284.pdf
    • https://cometsecurity.in/admin/userfiles/file/44731966933.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c9bdab4eb59fd998839ac8b6d2b72ba2/bozizekat.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uqen5or2t6k88s056nq1dsi0hp/botamub.pdf
    • http://frutapac.com/ckfinder/userfiles/files/ziperumuboj.pdf
    • http://vietthanhstone.com/images/news/file/22908023617.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/3207d460674c248b35840abc42ee7bf6/26021283218.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6ea60302d75eb7474b38417985e25200/33587533836.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607051179aea9---45900819579.pdf
    • https://alutat.com/data/file/90769639783.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f7adcd86b---42783309623.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0ef542c6e249c7270f8ea9286a9bf7b7/gupuwagawebovefopujilerov.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/e63b146d01756112722051106071e257/xeberowinedusupage.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e4c6c3f0---wunosalu.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745f276ca15---gaketagubotilegeke.pdf
    • https://rivaflo-south.in/userfiles/files/63812834901.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a018a248---80285702760.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/19tudd8a4a0gqd0r1r4tnt8g30/matilafivizorazolugafopu.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tnrbjn7tdotrb6t8q34h17595s/teroja.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/duwezamazodevilitudigesat.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/s67o8rsvoh2prr5a23cl3t0qq2/72585785674.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+update+android+version+manually
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f981.bin
e50204fc06c2a33df5a6dd578f554cfe5c6b9a100b51f5288c44a202d9c24ded
pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 10908 bytes
font_01_sfnt_off000112bd.bin
88c81b710d1e97b7f7c972453feacc89f5c4ddf44f272337f7dd536c80ce81e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 17612 bytes
font_02_sfnt_off000140ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140ED 16792 bytes