Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9afacd9e7ea377…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 12:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef95e7ed9fc6fe72e4e36393b135bbbf SHA-1: 3943d6d6cee87d36461853d172bc46972a5f1033 SHA-256: fd9afacd9e7ea37712721375664e4613e104e1cfd7f4eae3954d020d37dd56be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute malicious content or phish users. The document body is unreadable, but the heuristics indicate a focus on hosting external links, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160831b26c7022---98311158643.pdf In PDF document text
    • https://artlabjo.com/userfiles/file/buravapirafovuzitelowilek.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85704dbcf---zagukeg.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/dabifetixomopur.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/2a92b0c6f5a66ef1737bf00f4b0c0b90/78447023556.pdfIn PDF document text
    • http://short-story.ru/upload/file/97626644367.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb8a3150e---sefafijebadutuli.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec0563f06---fokidebeduwiditevunojuv.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/3704796290.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/n3fc36avl4s5hjlq6t8ves3244/fonofonekotaviva.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160832b25d60a8---5113469250.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b649d2763c2d3c197aab6a84a6c9fda1/69831022686.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/47245950feb1d72268b2e0339a162c06/20457038334.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/t8jr3vof9abdebsf47br0qofr2/76373284943.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/39cf2ca01dff6bd2a675fd0063e85fb4/80687659855.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3afc96622---jixoxewijizaroworupa.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///97212332196.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609481c99a207---61946531166.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/3940873431.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/27324946009.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/f9e8f6440db83d3026d117a630923f59/624791955.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/55711865034.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/71310029621.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/wagexid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tingling+in+face+and+headPDF link annotation
    • 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_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 10232 bytes
SHA-256: 6ff38499cb33240ea25c7b7d0466496f96d3690d21c4520067eee2c128502283
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 16992 bytes
SHA-256: 177c1d1ca8917931fc1d7135d59c24b7ad714ea65e205a01f97005c2839f30be