Malicious PDF — malware analysis report

Static analysis result for SHA-256 462b9b6d160b4dc4…

MALICIOUS

PDF

98.3 KB Created: 2021-07-01 12:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 311afea2bf0fc84004ef3d07d20b80a8 SHA-1: 5000f9547329d4682409d26b3cac9936c40e717d SHA-256: 462b9b6d160b4dc462da3c6421a0cbc8fa60707bd07b09f7a739123a3e957ee6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs and the PDF's structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a892a3cf7---pavinuxafafebeg.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/rigawutawinamosoziki.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5962cea025837d5082b472ce327c2966/72241982042.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5101643b0143b29fbc66c92affc4ecda/40343850482.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kexojageberukebu.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/kunolog.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/gimejefelikilimu.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/pirokibirodexewipa.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ef0f8rcdiphheuh8rjiilrd0a5/98809322325.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/duzak.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3e16f9c04451e35948011712c3201624/dakufajijuvonuvovalajag.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9845ik2ppcsmp8se8k25orenj6/53986947612.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/42231399629.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/9390420619.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gabamigevoxitokanitekubo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c28de99f8e7---23442277928.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/19765953246.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa32ce530b---bosepuvujetage.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/8e076c97c8dc28d6e1752d01588135ac/26126276507.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/37674044778.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/42e2rvftffgfllrmmis5r1bmk3/65670472596.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/sevigodifi.pdfIn PDF document text
    • http://come2menorca.com/images/file/48466532717.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f3e1c89a7baa31e299f4a4ed3ad4bb13/rebidubasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=one+serving+of+fruitPDF 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_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 17684 bytes
SHA-256: b6201ac7ccca54f1df7a8ffecd9fd78e5555a2860106b35794ae0479367674d2
font_01_sfnt_off00014b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B29 10372 bytes
SHA-256: f9c39d1b21b4f32e69ca4085674f908d5df5c5493f6b700c6983093829b1a484
font_02_sfnt_off000162dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1