Malicious PDF — malware analysis report

Static analysis result for SHA-256 492b6b0d68efd73f…

MALICIOUS

PDF

105.0 KB Created: 2021-06-28 09:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b5037b369e5c6f7f883ef09c6cba965 SHA-1: be20fa68d86ee8fd2d86514f0e80af47dc305673 SHA-256: 492b6b0d68efd73fe6cb62394ed1d7eba3640a2b19cb6a9670b9526191102b54
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. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs and the overall structure suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 http://aldo-ins.com/userfiles/file/85159615580.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f3ee63b5e---ropelasa.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a291346d03d---zumafod.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/bimewujakadobibegolu.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbk20tn0r40lolfmiblt3ptd88/56998704619.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7a9dee70d8549f9e7910c6a9eff5b372/85858314103.pdf
    • http://grupposcorcia.it/userfiles/files/xalavij.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832fe6cd26c---70094616504.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f5d478397---gajazeziruguruzavulagedep.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a7654ccf---lixaravuvivat.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b059aeede---99247078488.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/54d42a028168c8465924adc79416fb6b/90663098417.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65e6609b1---2495071008.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/678c33f84e0d88cc29c062bcbfd5418d/vaxemibozuzonobodil.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/155dffc277ce86cae7dcd1c39ffde68c/86520182415.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b0b365455042a90869c72bb077647a1b/37303420009.pdf
    • https://schmitz.cz/res/file/vikijodore.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hf0sm2cp0g5lfbaj2nql9m4vrg/pufijotuvomipadoduz.pdf
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/82036172194.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/92ed7a951400e493998d567451d893d1/pawaxogosenowubef.pdf
    • http://dobre-jaja.com/Upload/file/47545281397.pdf
    • http://minerva-collection.net/files/files/3357979828.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c4138cbb94652c46bda75f7ee588cac2/92011726953.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/l5dk12c8gjc3quj7d4tu03fh6d/xavofeto.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=warzone+is+it+free
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 16792 bytes
font_01_sfnt_off00010705.bin
b25fe7a2b31e0cd40756f1042a76573a2bb5d881f3044f1e0e80f6aa7b9ac4a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 18124 bytes
font_02_sfnt_off000136b5.bin
3fe083bede8ac5866937fe9379ee9f679434f7e3c58ed061cbc181f1831863d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 10212 bytes
font_03_sfnt_off00014dcc.bin
d003eb5295d6c2c3516011457498e885d731648180442e96d734ca70c1f0b552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCC 25716 bytes

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