Malicious PDF — malware analysis report

Static analysis result for SHA-256 263ba6b600384330…

MALICIOUS

PDF

73.4 KB Created: 2021-06-28 11:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a3cd59df738e74a36f076d536077ead SHA-1: d22739d93a6d389927e149011d30df22c71948b9 SHA-256: 263ba6b600384330a606deb811aaddf02b84e6ff80353164b942d208eaf827a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these compromised sites. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://wastran.ru/uplcv?utm_term=pearson+my+lab+test+answers
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c58948a8f01---tozegatogilera.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0f1bf1a504e67f084a97edf37c891bd4/vunuwedumutusole.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf40fd7031f085208d0ce8693c79fe83/87018417245.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/50c987e2de64123176254d388099a632/vesaxosojome.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/83cbe931e993ce51b54ae0cc092dc547/jesekiles.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bd65b455b---95285236102.pdf
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/81020465100.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/zafijesejegesavugokawew.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1ff3e6fd0---setowikeseduxunixakisew.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/i3gpk1l4rvd85ae13gejmbct92/nusofuwilavoxifa.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a40d55a68464e28b161c5082409fd867/relilolitobabajirav.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7aa939a3414ccd38cb5a9d71fda19d0f/mipumadimonatugodasasufe.pdf
    • http://brmxn.com/userfiles/file/20210604204312_4kpdkr.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd835e6d2db---21955675663.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/39844531520.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/jivofikiwan.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5f280fa7c8d2971db0a777fa1c55779a/84445925474.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d3c29f6c325e2b9214f8c852ebafd3e1/44052801208.pdf
    • https://eminencesolutions.in/resources/userfiles/file/1169374892.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bcugrsqimbh0g009u5pht65fo2/legemif.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f5c4667ff75a5c8eac3a5ae4026a500e/62490890355.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_off0000bbbe.bin
131eb887ade3194734f202acb134d8c016473ec00dfbe65390e588d0d6c360a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBE 10516 bytes
font_01_sfnt_off0000d3c5.bin
cca1f986ae0cd8a58521241436ec32ab0998cdfdfdc4de94ff662d8f01fa5a94
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 16796 bytes
font_02_sfnt_off0000fef4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 16792 bytes