Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a322c609852828…

MALICIOUS

PDF

113.2 KB Created: 2021-09-08 15:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e9e2a17bbc08bbb843f1e8aef1c0443 SHA-1: fdcfcf40394c027277d66e489a8ba364b1c77f34 SHA-256: 16a322c609852828a644ce8a9067893ec6624104ba9c2436cbb69888985f605a
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage and disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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://hzeiger.com/userfiles/file/31143040812.pdf
    • https://socardan.com/userfiles/files/menizim.pdf
    • http://nenayu.com/filespath/files/20210906142638.pdf
    • http://herve-coiffure.ci/files/potetetezatumimojede.pdf
    • http://autohondl.cz/userfiles/file/gobifibaga.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/41432602707.pdf
    • http://knuhpharm.kr/userfiles/file/20210906065059.pdf
    • http://smartcirclegroup.com/userfiles/file/nuwuwabexumafa.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5fabeb2a---jotogebitemopeme.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/92639468669.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388c7a60e21---susebaf.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161340fe533656---dunodutamofogobe.pdf
    • http://poexali.org/static/image/_u/system/files/93153315773.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae8d72310195dde26c768c1f444ea193/miwitedubijuwixidewep.pdf
    • http://huyminhplastic.com/upload/files/15385883723.pdf
    • https://getracemirates.com/userfiles/files/buxaxewabotufirudi.pdf
    • http://metabolitplus.ru/files/file/32702016973.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a654607c30c24bb17f7f537f98946f21/72115251844.pdf
    • https://aldapa.eus/files/galeria/files/zadofozizirupuxitas.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/golumeg.pdf
    • http://snieznik.pl/userfiles/file/18803150870.pdf
    • https://cafepiolho.com/uploads/assets/46691227799.pdf
    • http://tongshengchem.com/ckfinder/userfiles/files/gowukegafonezoweg.pdf
    • http://cuacuongiare.vn/upload/files/50789681234.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210907_30EF26F79019C739.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fretboard+guitar+pdf
    • 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_off00014ec5.bin
22cec14c979e715e50b1e0cc3429678296c74ba87e510ac6925aad350f45f807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC5 10572 bytes
font_01_sfnt_off00016695.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16695 16792 bytes
font_02_sfnt_off00017ea7.bin
7d793043a1237ff3933e1c8dd1a56832e65ede72a780be83144ce4d7e78409c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17EA7 21456 bytes

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