Malicious PDF — malware analysis report

Static analysis result for SHA-256 a331bcc5e830bead…

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 09:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a45dbcd4d5c3ef77cf89f417dbe63b5b SHA-1: 114fa5056b579891e14a23e24bc041981cd5805f SHA-256: a331bcc5e830beaddc25f3ff2853ffa9141e812b761204853a6c702d72692b70
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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://ketchas.ru/uplcv?utm_term=what+eats+snowy+owls PDF link annotation
    • https://mfdesign.hu/files/file/42567465029.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/joxofesexuxenewawetupesul.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c158078b3a6---pozufozovakudavevakufeki.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b925d70196b---welusexakepugodewaxa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b408a38e826---28703482920.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec79dffgk5j8n400sbrtls2am7/redenazivemoxefebigibot.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/123984f00049ee7c44dbe9d9a44e6991/rotugetikisulunedil.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160987d1d96d97---lopozo.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/76818386320.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607039cebde37---tadedodexotipaga.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/tonejuwif.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160714e5b410a7---renakuvavitavokifixibo.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/daragosa.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/luregeregepegidazep.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1d497106ac62d89bcc30bc47026dcceb/94776752624.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9kspomfvckdrqlsvb412oe66uq/sufavoze.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc82b1fe42---40550155292.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210610051044.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/097fc4d90dd44671cff622c9a45435bf/995915725.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086588ef17ea---96278307926.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/37161597728.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/432c857b56be5e0057731ad9470a5be4/pubululojisuz.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/jefuvi.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1a410410513d56b59656bc5bd1f2a256/ligefatid.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/06721qvi4jtcpeqh09bcvc42i6/waroxotoxowebo.pdfIn PDF document text
    • 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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 16296 bytes
SHA-256: 2012cd82c4670a5be5c154c155e8dce11cfecaa10db615ed77aea888bb9c539b
font_01_sfnt_off00012943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001415a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415A 10204 bytes
SHA-256: 737138fe2c307f6b2f26f0327361c8363d207e576023f4faae2d110bb73b30bc

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