Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1b720536356a3d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 17:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f5905a1740633e5359e396f3154505c SHA-1: 0f18cc91223689481d5931ca535cad49b6c328f1 SHA-256: 3d1b720536356a3d288944d7e60aabd4b2bc0f26ced025f1048a7f6049b05582
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking, further indicating a malicious intent to lure users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=underwood+effective+classroom+management+pdf
    • https://strategie-forex.com/ckfinder/userfiles/files/wodobuzevegezejejedigovab.pdf
    • http://abworder.com/uploads/files/kogoj.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ubtbp5k2f3nuhndgv9mp10dvup/44370299035.pdf
    • http://chromowane.com/userfiles/file/gilemawudu.pdf
    • https://europartner2.pl/uploads/90794785095.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8847756c5727e80926fd2d65742fee9f/mapisi.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4bf7a07b4ba5d8d9746288a799517973/55554700447.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16128e0b042708---jutazomaxawivemuvad.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4ln0f5m5sg87cho7142o9j8uf6/sakugalo.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fe59c45fc22---22555356247.pdf
    • https://charterfori.ir/basefile/charterforiir/files/zuwuvat.pdf
    • https://ingatlansos.hu/images/userfiles/file/95816550700.pdf
    • https://bdata.vn/upload/files/53374275331.pdf
    • http://webbuilders.com/files/file/tazuwipobubezijato.pdf
    • https://blogsma.com/files/12271894199.pdf
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/14444102517.pdf
    • http://u15.ch/ckfinder/userfiles/files/31096085346.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608310050a028---31720153733.pdf
    • http://unipsyclinic.com/userfiles/file/20210512125407.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607623ce01a7d---nigofugefisukifigaz.pdf
    • https://linoforti.it/file/dulil.pdf
    • http://dytac.hk/userfiles/lotazerisejeza.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6f5567234---sarobeda.pdf
    • http://aryajob.com/user_upload/file/77768173532.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ddaddd021c---gomixafapudi.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6fc.bin
23a16ba4cb57403da6b54629e3b6dffe2c0cf5c24b8510d6f88035dde27f2cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FC 16940 bytes
font_01_sfnt_off0000f2c3.bin
efec94da25574878856cdb505ca95f02c80d33ddcef49ff34c2324a190ce3807		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 11124 bytes

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