Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c01a87648bffd7…

MALICIOUS

PDF

93.8 KB Created: 2021-06-30 04:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 458a159ed6cb5b8b1630abf80225949e SHA-1: 46732a473eaf3a53ec8278040762e30cfada7ed9 SHA-256: 76c01a87648bffd73973b39c1a435517afc0eba4998705b639ef7e8261f5341d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://laborke.ru/uplcv?utm_term=team+building+activities+for+youth
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c700797e0---gunafodizivajija.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/gadizaj.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16224667150602.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/11953428664.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5900ba32dc0701fa083f2e589461aa58/jabaxufemaso.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c74c0cd63---letuzisa.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/29a87775383135fa1e4e4facdd9749b2/89911789375.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c628f0a7306---74163721428.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8b6o12kpjjfa5fpq3fpms05ab4/lerixiparales.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/auqel2abfbdjn18uuqri1vsvti/fuzezukipazezodonal.pdf
    • http://ranaghatpchsschool.org/userfiles/file/14212323676.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160dba1e4debb6---83380813527.pdf
    • http://technoculture.cz/admin/upload/file/bojezatumumuno.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e28be859---zamolixemi.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adb431dcc85---69704365985.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/lafidolefowigosive.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca9aeb480---14411431529.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/abdo62qu11v2fcnso5kmpq67q4/88426874562.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/xipatabozesivifotumupufan.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d0354fedcba---96623660562.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c86f43ae0862041bc938307aedf9dc38/42662337362.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc639fdf084---40611991740.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bd378e2a91e10f48d435331dc5ff9739/70675560627.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae14bf801a2---59526100720.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3db0c8d10---74819239314.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc90a5294e---58005049843.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dbdc5bca0---bojipogor.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_off00010c0b.bin
a882261ac196bfb76f5f24b55f838e963114dbb532cc76548799db0287d8afd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 16740 bytes
font_01_sfnt_off00013761.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 16792 bytes
font_02_sfnt_off00014f78.bin
50e398e62f5d37837b52c0bd0cd43254f92c91c0ad8189dfa988cb901c86b29f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F78 11308 bytes

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