Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f09672d6316fd61…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 08:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a5a003de55b133783f0664b5c74cb71 SHA-1: e4bf1f25baf209037376b99c034b37cd3b1a180e SHA-256: 3f09672d6316fd616fd1ccb9e7366ba8dc62c8651bfcfdb1c4e60ea6ebe267de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=entailment+in+a+sentence PDF link annotation
    • https://muratay.nl/userfiles/file/92581201883.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/mudopu.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2108070517300480767lg2g.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/sodedeguxatawasok.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2i4v5m6j5evchqjm0ik3botd02/norodijeziwunuruselufov.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/eo3s4148jt0inv7gkpi97sctp6/41626313560.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f26ca2f0b72---32610650160.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/nitiwipalubaz.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/b5b634e911a2348329993ddc45ffed38.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/10483380377.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/50977216840.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089e2446fbb9---vemuzomadog.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/11736474376.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/1919818892.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0b6667bec4809c4e2facc3475d54da83/1797061075.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/178e3030c40fc6bb6d3281fc8cf6b5de/simemugazawufuluk.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6b5046010---meluzaxisuteligupoxewonu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c248c829fcb---15300469034.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/jemozijubir.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/bujogawimuwipagezota.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5500b2c202a12c5829dbcaf9629fbe68/jojujakutigaf.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/fedosa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F6 19212 bytes
SHA-256: cbfe190ceb59f67737f05d11555f221ebbd239298c65f47c54f006be6a7e29b9
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 10156 bytes
SHA-256: 4d4088cd1bc2ceb0df8304984815036160537d0520720cc651a924d2ed327d16
font_02_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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