Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6014469ddecfe7f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 03:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d34339923dfd3e04667b144c5656074 SHA-1: 8d195dc2b414d039777931b95600a22cb492b3cb SHA-256: d6014469ddecfe7fa3daf92c2bb35f2b540d3bb17f2e9008868785847eb52b36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's part of a larger campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/dfif5ikv2cruj9c8b91g1dpe5v/tadobamelazijuti.pdf In PDF document text
    • http://feg.vn/uploads/files/zepuzujemonavipatu.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105240223569565.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/muxusokine.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/duxipememo.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/jugikufakek.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609403bbb8a5f---44723963851.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/290k2fstv4rp55h3pcbq1ikse5/51576463626.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/74654351400.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/4him0qrgmkbu28tg05m8h1gsbd/newezo.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/gimizejenugivewunurodilor.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/pawanijediw.pdfIn PDF document text
    • http://360global.ca/userfiles/file/25582916479.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607916784ccb4---muvigolodatukeme.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe7ee5d8ed---44511105444.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0mjcgpbne51knhtqfapofqiod7/7728064626.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/wipedimajusizumazojoxidu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086619c597cd---78451782323.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/kireza.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/on3l18vq1dcpn3oo807r9jnpq3/vezotakajekite.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/47339139828.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/wufevetulagu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ab0a91e1---35163123219.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/50b844bbdf2ba7ac3de51ba8d35c1299/27576845537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nikon+d7000+specifications+pdfPDF 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_off0000b6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D8 10708 bytes
SHA-256: e5cb989c985ca8f5d7b6964a1344b20c160dfaba99f964ec62d888b49a2acb24
font_01_sfnt_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 18132 bytes
SHA-256: e1bcab78459c24f3e641c760b028e47326b0058abe24f59fd293c7e609b87a29
font_02_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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