Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdcd7f2d8d68c61…

MALICIOUS

PDF

80.3 KB Created: 2021-06-19 14:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 66d79c4b320100229e160de5eb256f69 SHA-1: d121eb498ab2a6fbb90e94dd286b8ca1644d4b4b SHA-256: 2bdcd7f2d8d68c618342e12aa78db7f1c4c532ea61ec5582477f7c99fa2ee7c3
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, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=insert+image+to+pdf+mac+preview PDF link annotation
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/jpt243679jq4gu8beadlb5gtv7/57838692825.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nkb697kvjt4b6v8fcd5r49hfn1/luvapexiwozegitisifadom.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160833240c7656---20579977625.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a6d7061e---82315182064.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/74797191544.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f5ed65c3d5e2288296e1131df08f49a1/25158948511.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zenusofawupot.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/lmr1qlauallhpug5u0mifuof3u/sejonuwenafodusifavol.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/19206062561.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2de2133e6529ed7f47462eef08463b0a/kifov.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/1253886442.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/dutaju.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a29a64bf1e628192b8c4bcc809692708/pitiragofajoluvukala.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef16756aee---22173412500.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c51353df2---vuridazuvebabot.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a9180ad106802ea045aaefe1ae2e5124/kerujimokojer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 5532 bytes
SHA-256: bfbd586a416b24ed34349f104e919f2102e0d88a69c938f05f4a130bc91708b5
font_01_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 11040 bytes
SHA-256: 676296c5f5241f0f4caad24bf319fb57506a4213f9637ba02ac012a5548bd8d1
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16532 bytes
SHA-256: 49df90c478a3e9a172c774ef775ffe53f71515933914ff33a86d3af41d67c383