Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ff635c31e86baf…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 23:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1e65362bf04a78ce961a0e7a8c2700c4 SHA-1: ca97d94d6f191b06611201fa5399891b45bf13d6 SHA-256: a0ff635c31e86bafd05fe16fe0edd37d44954014d71f2a40c69fbfcd7300b014
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ia49cbef02gm2kdq9h2aikbnmo/relowotatovif.pdf In PDF document text
    • http://kaitosushisb.com/uploads/files/67049144725.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/14461523238.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/67093398542.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/e816c07102bf1e1abab6b029f5955b43/duxomusux.pdfIn PDF document text
    • http://kahasat.cz/data/file/26809221604.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kofokavekutilutonato.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f62afd799bf875992cfea311d16536af/53477303790.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/57579443384.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/64070641349.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/56589290930.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b288a0ffa---lovunizu.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/89209495684.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/zulosomuzubizibugokiz.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073edab70487---14497320011.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/99775869539.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd3e7c332a---xalixedibexerupinug.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/27aac120c8f351e90c1e58ec64c77505/lanotepukupejifoxeva.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/45779912666.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/7eb700929c3a08c6b91d6826e49fb9f5/vadajipilutuzeromiguzak.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ec8b354cdba8b5fc1b17fce38c22febc/83221123852.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/34296659004.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/kumatapaxawuzevafezeziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=club+car+carryall+1700+parts+manualPDF 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_off0000ce2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 17292 bytes
SHA-256: 656387f76e00b0840a090a977547c768dbaa7fbca5b2d5c7d60857e42863aa55
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 10800 bytes
SHA-256: 5c306bd11949ee1772713eaee813ef8a60a7eda2bf0917e0b7bf07e984583ec6
font_02_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1