Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf675b575b0b786a…

MALICIOUS

PDF

81.3 KB Created: 2021-08-13 02:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f76677274c9c9aeea2c28281aaa5a7ea SHA-1: 53888af3d37c284d5a9dd4a0195e2bfd4864c6d8 SHA-256: cf675b575b0b786abb4c1dc5015822ea360d0368a9c3ebaf2e95e48a9b011dad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://garglob.ru/uplcv?utm_term=7+years+in+tibet+book+pdf PDF link annotation
    • http://www.annaleehuber.com/content_files/file/takilamigale.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c308e048731---55818065768.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/neveserelobipa.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/pubib.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/25997949253.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3ea0eab1e2012d6b510b6ab21a19503e/74152862250.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kafhrjissgnma17rj8b98f3ca4/tebaninubepu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nezesijenizokubokipusog.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e569a805---xabuneposozi.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/sotozo.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/91979608732.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083162c85a2c---19206832679.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/xotupif.pdfIn PDF document text
    • https://rintrans.com/files/35485138088.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/0ql7cpcp4212s1hu2gniai1eis/vabewivowugid.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/4ed1ac3de0789d747718683157415d43/54924231424.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/33258711734.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087552790878---37702023125.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/ligurajebisenus.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/53694505469.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161056714d7326---xeposatu.pdfIn PDF document text
    • https://medtek.vn/storage/file/50284520880.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/83524008078.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4605h1a9unnhbfnpvbo779pcbd/10884392650.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_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 16768 bytes
SHA-256: 6885f0f39896f5f0a1fad469ab6fe6a9c82c99a95cf501bf69f36f4ecec7ff03
font_02_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 10744 bytes
SHA-256: f1d0fdb9599cc286420c2b22768a0ee2f3139d5032ee5b3626a0deb22dbb6f0a

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