Malicious PDF — malware analysis report

Static analysis result for SHA-256 8243c226616136b3…

MALICIOUS

PDF

94.9 KB Created: 2021-06-27 15:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebc5454c48885a2f522c32a1f4dc4a8a SHA-1: 50bf93f01b4c917c84c4f76ba0d83f56592a1e94 SHA-256: 8243c226616136b3dbcc99954ddaa08c314ec77b354832cad3da4551e2ee781b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://medvor.ru/uplcv?utm_term=children%27s+bible+questions+and+answers
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16081f02ce6db2---34181986972.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/22cg0mq982l5merdqjaual6opl/kopalafekovedew.pdf
    • https://careersourcechipola.com/files/public/66165885101.pdf
    • http://tuzvedo.hu/elemek/file/56667715804.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e8f9e64e1---xuwiruw.pdf
    • https://aradmissions.com/ci/userfiles/files/xijikovud.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1urru1aipfupl7329tr7r5tqoe/jijalelifevivowenoleriked.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608247fd17ea0---3395642241.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c2habujcfm2g9qc68h2km5gci2/pajavunizibaxanabeki.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160700fb01aa5b---xutej.pdf
    • http://akkoryazilim.com/userfiles/file/23214214969.pdf
    • http://stepasidemedical.com/images/uploads/file/palew.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/zugudez.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a370a9d8efc---64698813654.pdf
    • https://fotofidelity.cz/userfiles/file/7805506513.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5bk2qiiq73hbuia300h1it0iae/73409926952.pdf
    • https://superpart.com/files/39326020108.pdf
    • http://animalscipublisher.com/files/upfiles/file/75725498608.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ueqieqq3mculmuurm85s4g7f84/tilonimanaju.pdf
    • http://tanriovermensucat.com/uploads/genel/files/65706095953.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/87365614978.pdf
    • http://bagiez.com/userfiles/file/84196172535.pdf
    • http://files.ibiza-ferien.de/file/lojunejima.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/f88am9rdt4t0hspk5rm0prva33/madaguponi.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9885fd4aad---fexix.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_off0001113d.bin
b68981b9b752ee62cbcd8ad38a6707f7ade73742c13106291d4694e5a370812d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 10880 bytes
font_01_sfnt_off00012a30.bin
276a4b6fd9d7fc82bf154c271f9dfa19a5784518488c9ac4e269a2880ebc9951
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 16844 bytes
font_02_sfnt_off0001561a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1561A 16792 bytes