Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cda695f9e3e4199…

MALICIOUS

PDF

95.6 KB Created: 2021-06-25 17:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20c3899bcc01445de18c733196563146 SHA-1: 0c6d7241080b5d66fe549b7ac1ba8240e12b3e65 SHA-256: 3cda695f9e3e41997bb8cc6bb1f3e3405fd211a88549a7aaa4ba3ce7c6b62ecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF identified by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads. While no scripts were explicitly extracted, the presence of PDF_URI and ML_NYX_PDF_MALICIOUS firings suggests malicious intent, likely to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/774c517e2c3c53b39b5c23e70045efa3/pimimo.pdf
    • http://www.logomarcanet.com/userfiles/file/20615327156.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2763157d84---85734843932.pdf
    • https://mytopics.it/uploads/file/jipemejiduvotuf.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b234eff9---36926520258.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a4ed38b975ed852fb492755144a1d97b/fepuwamowipefenufurol.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4f7e78c0877b682aca13aab510576580/5382986849.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/t0a2d25vsgk855r8tuaoopiha2/74706531638.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a72b0f0b85---wibepotunadumadokig.pdf
    • http://krevue.cz/UserFiles/File/pofezabowava.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/054d71fcf91b4891f843717b859c305b/94102663131.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3a479f1220535f9309265d67fcdc5510/vafizazipoxuziz.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/58222cd661cbdaec3a4fee952e8c1af5/11607279225.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8c3bc0c8---4637394285.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ae7532ccf617c1e1012cb1382b184b2e/16558623821.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/nobexawexuxotovozubosirom.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784c53f2d22---29677807972.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/60826e4f8ed1e92125567714e8318f01/35080640588.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/76721e0d89d8a22d7d8245274ee5a8db/47569571530.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ae758e49a70212639b6afb3117b6c4d5/89654781702.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f32ff260c9---tevobajudepoposixejaz.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4beda59e---dekusaj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=steps+of+cellular+respiration+chart
    • 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_off00011236.bin
34974ce2f96a7cb4b924e7651e741c1b2803d549c727ddeb37bf8e65f79cd9d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 10752 bytes
font_01_sfnt_off00012ace.bin
3c8fbc1e0c1d629035143a3770d33d62a2e10283d7c64bdd082cc3f9f3155ae5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 17536 bytes
font_02_sfnt_off00015947.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15947 16792 bytes