Malicious PDF — malware analysis report

Static analysis result for SHA-256 601cd06912e1d52e…

MALICIOUS

PDF

100.9 KB Created: 2021-06-29 21:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bc514d11df7c8f92acfed17aae83e6f SHA-1: 673efea14de3d6f6fc5e66b7cf16da931242c008 SHA-256: 601cd06912e1d52efd366654c37bf160f7813b5c8d5e5b25db4ca89d6537e32e
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c6174d003d2---rutakuluxofekedexokasu.pdf
    • https://t2sc.me/userfiles/53922828666.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/cb827b711c481cf966598553cd50d89e/jepopanewoku.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef00738dd---xobujutege.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a5c61b1a84ea951d02cfbdbb3213447c/83373855374.pdf
    • https://bouveau-consulting.com/userfiles/file/siduwanewezidokesowa.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/59aff87c62370802929af1ef8edd9229/78858984240.pdf
    • http://guitarenko.fr/img/files/28105188515.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/32ee9688b60b85cd7f5f80c66929de6b/ligisazaponetiwasonuze.pdf
    • http://dailitara.lt/bites/uploads/file/66890155415.pdf
    • https://digireg.cn/upload/xobiwav.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609db1e46236f---6198421576.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8ee0bb0bc---60427951157.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c123f922c49---88158908388.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ffa36cd17---sutakubufesomesu.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8ac6c88f18a0122cd29a525fb9107e48/nulezunisuvusefedina.pdf
    • http://minutemen-jrotc.com/clients/84940/File/73165981113.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15af2053b0ccd0ca80c04ce56931b744/49826780046.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f4b5bf87b6053d883848766469910d40/nakuzilidagajusefereporo.pdf
    • https://dcimx.com/files/2431403629.pdf
    • http://wccflooring.com/userfiles/files/razokabozile.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=electronic+configuration+and+valency+of+first+20+elements
    • 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_off00012479.bin
23e925c32890f1ef004722a52732e25687a1179987b064e83e609877b3a068fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 17904 bytes
font_01_sfnt_off000153ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153AD 16792 bytes
font_02_sfnt_off00016bc4.bin
e45d8d2ec6734c08e6f4f93981231dc86eb78b2b7da5074c853f035642a4e3b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC4 11324 bytes