Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64cc906c493b7c3…

MALICIOUS

PDF

90.6 KB Created: 2021-06-26 11:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbf8861aa3bfa0793708a10708c33e18 SHA-1: 9c4ffcb2b121c494b7d061bb23897380760aaad7 SHA-256: a64cc906c493b7c3d4d9e68d426cc5b40ab1f5d36cdce4931266f9df061586f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to host or redirect to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/97a964b7424666e7de06923d7fc425dc/75155344771.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0770cc6f9---tanivajakivepora.pdf
    • https://arerp.kr/data/file///lezinatoraxorujosasamegu.pdf
    • http://pusancard.com/userData/board/file/tifutusejux.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098676e2b534---3818710333.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/de8d7ed4c93ded919f487c3753fe1732/sukijuxax.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d73b6e311e828268a531459dd8f18844/61128888003.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qn9dbk5iai6jvvfdnjao6p69mp/bujibajurevobukakosaw.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/96163561843.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85ffa1ff5---goridavodig.pdf
    • http://polimak.pl/userfiles/file/23388001854.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b9927665c---52055964264.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606da12d000b7---forirojovax.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b05b323f0---zavise.pdf
    • https://bistakalikotenetwork.com/userfiles/file/pusadinujawesotabuvasuk.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/62552334556.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8ae32bf75---dikarowuwedepeboxata.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/af43odnhpthhga24287s777j19/91732185443.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3b9cbd98---82341067027.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/cqdgm4hbtp73besh1u2g7fjsmo/mozuverawiji.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a34f3a43---nekidebixagotuj.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/9425c4c434809dae549375022dfacd02/tidiwag.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/runinelunemogobirerorej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+dead+will+tell
    • 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_off00010271.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 16792 bytes
font_01_sfnt_off00011a87.bin
5b01bedf3fb3bb2ea29c5d69a8d809ed4f9e4b89797ce8dc5ae7d097c8e012bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 9900 bytes
font_02_sfnt_off0001307f.bin
ec7b40bc67026c9a8bc43df2eb364271849b6489ba198778de82f64f57ca3972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 17220 bytes

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