Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f415bd563a1db1e…

MALICIOUS

PDF

81.8 KB Created: 2021-06-23 21:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2a40ed5403882baa5ea23adfbcccdcda SHA-1: 6b5d52bd66b9a3bd5a8616c29bdedebc0cf16ccc SHA-256: 9f415bd563a1db1eafbb280697ecefd1f65b1993ed39f2c5fc533b2bb435f6ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9214

Heuristics 5

  • 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
  • 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=muscle+strength+training PDF link annotation
    • https://baoholaodong24.com/userfiles/file/630030650.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/28405007586.pdfIn PDF document text
    • http://ahchala.com/img/file/6579214271.pdfIn PDF document text
    • https://wsbtitan.com/images/file/patapebokezetobok.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/riramenokimezifufakidul.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ed0a76bc---ruxedisevutumi.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/velafo.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804e6474a1e---355285456.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/kobumugenefalola.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/95623914933.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/17184528504.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/gozuzubeg.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zupolilatosevesobi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9194f1d3628eeed62988e0955e2105c5/6952545666.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/70608969941.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607763bc7daa9---83921975557.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608388b84b968---25466389814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 5064 bytes
SHA-256: ad4074dedab0534cb7409d1cd4b5514c0215f365fdc12a193a1260ab27beedf0
font_01_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 4848 bytes
SHA-256: a2f9d2bee9231217eba98b7e678f89cc07d2891ebad03976d3518bd480716241
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 11424 bytes
SHA-256: 7543d9f0c24ee2c6233db050d42a84c8ca82144bf7fefc1b1eb8f006372e7452

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