Malicious PDF — malware analysis report

Static analysis result for SHA-256 691f62a482bf7aae…

MALICIOUS

PDF

69.0 KB Created: 2021-06-15 18:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b37711d380591ab2662a76f8d39216c1 SHA-1: 0e4543b66c5b54e58e7d1ae41a35a65e81d4f1a8 SHA-256: 691f62a482bf7aaeae30b2f9a76d2e96c5713131c802589581dced21446d1c82
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to product searches, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=iphone+7+plus+necklace+case
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/304fb68c885596c2cf7520f5cdfb69cf/45912537353.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/17758801493.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084634fc9476---60670071991.pdf
    • https://airbays.com/userfiles/file/zowadi.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ac2a4ff0---73371102434.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904c1a15fcd---33166825377.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d62c2695f8---55789888085.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607307ee70b38---vufexu.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/xagakibuneteba.pdf
    • http://automsystem.com/UploadFile/file/20210507102505146.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f1l7gl2jmji503dp9a2ibgbb03/68820229481.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad907f1725---nelagok.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c667304cd1---burejogilegonuxagupedaj.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160819fcec0056---52655074457.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5ca.bin
3fac2ba0ed7a9fd5788d4e41d30f270194bb7e6bb26169c1ed1d19b17fd013c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CA 5008 bytes
font_01_sfnt_off0000d6d1.bin
08d4f81f0daff4449c1abe5c06fc2aee4a52920d707249e9ac396032166b5261		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 1880 bytes
font_02_sfnt_off0000dfe8.bin
77af48a3e1526db0889669fb7733ce5172725920d187db5749c00ad00d6913d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 11052 bytes

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