Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a07d57c5d1c1c4…

MALICIOUS

PDF

83.8 KB Created: 2021-06-12 09:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5bb07c191d70d5b7be8d5c12e491fcc0 SHA-1: 0e7c0c3543d94ed6a0d9480d0af5ab4ebcbcc856 SHA-256: 70a07d57c5d1c1c4c103e949f6f45367c0c933ac41d4a6d382d98887e4088bf8
176 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=500+korean+words+pdf PDF link annotation
    • http://xn--szabowski-tub.pl/userfiles/file/70955697594.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/79528791306.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/40fcb1427e3d6b53cd4b793d537de306/nolezu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e115d8119---66961247888.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5cfae26d306d6f663d7fab2944fff7aa/81926813975.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/mavosixugokiribokosofesit.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210611_2AE1A8D7D158BE3C.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/018c223081f76bae8e23755394e120c6/fixumosivot.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a2bbdd63e26784df3195e729bb3e37e0/revozobovuwenu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/tozapog.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/3276868796.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf5edd5bb---12780482419.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ajk7ma7g44h9ethcl3rr9paus4/tomuxapozenorekiwenazi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e6e394e333f9b9856ddc2a921ca6519a/71488611423.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/4742282378a971e1c9e2c4c20639eb01/27967241133.pdfIn PDF document text
    • https://marosme.ro/hirek/file/kukupapisetobiz.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 7724 bytes
SHA-256: 36e794443928c626f670296395516dfa5dfb99a5d4b8e8d386ebeb8a33c91c56
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 5328 bytes
SHA-256: b5c82322f01ed2c5ece27438c61625ae1e2dea0cd714de88246f7b5d951a8688
font_02_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 12640 bytes
SHA-256: 9eb68611548f17365b359517e682110455b0eba8e01f3367b82a4fc15be3a8b3

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