Malicious PDF — malware analysis report

Static analysis result for SHA-256 5172c43a2f2fcd83…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 10:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48b408aa5debeb2dcad64d5bb806e2c2 SHA-1: e884ab2cfe9e491f1eb2c219d9aa7a6c06aa29c0 SHA-256: 5172c43a2f2fcd83c01453e3b59f0395cb9e8d4fbc3b8efd915387bdd76a183e
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm and potentially a phishing lure. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic to bypass gateway scanning by instructing the user to open a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2shle53bf5pvo01ca5kp2kmu3r/91042315928.pdf In PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060219464280554.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/22437427843.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/letububolazuxaximi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a976ce1b---tabudivudivurixasugavupor.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/tepimapes.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718f8b5ba60---47738720706.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/zuzijawinemiwajezemosub.pdfIn PDF document text
    • http://bienbao.org/uploads/files/64772218105.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/32776808759.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cb90578d767---68735384004.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021626254593757.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0ff8e09ujh1493s0ancccves0g/denewodibenajetenonolog.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/dc7c9076f124ac676af8385c06d8cc57/zutiwerusarokof.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/83f13f069e90105a9c3d7bbce57c8f03/revexuzawegavuzunara.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607200b084005---kenogir.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/tofofosenobif.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/74366f4e866bc051f42911bd3fa1012c/lejorubasizabezubi.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/gajapexowuxib.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/79k6d7j31htko26uulj04bs4o8/rurafewowanaximan.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/73136429641.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b0fb52e0---32043378003.pdfIn PDF document text
    • https://5udua.com/contents/files/25188665834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=i+want+a+may+baby+when+should+i+conceivePDF 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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 16552 bytes
SHA-256: 91c5799eb211378bb88748b07bc2a45b4e70c1c4e85c447e2a50941c2c502c08
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 10992 bytes
SHA-256: 88b59eb4d0c961d7f854e537f6e13c672c7885790e6b3420d128e7e8a31560b3

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