Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de5f77571ab2545…

MALICIOUS

PDF

72.1 KB Created: 2021-06-22 12:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b5f4b3beaedce3a07066e24ce5532dfb SHA-1: f7d7b0857644bc96f625bcd2911a9641f66d61d1 SHA-256: 2de5f77571ab2545df0d7a11a9ecbc4c6cc91eb32dc07b239350205f49d1dbb1
156 Risk Score

Malware Insights

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

The PDF contains multiple URLs pointing to compromised CMS upload storage, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/68fa82960e3383cb5db0cef6ef0c5045/3655712608.pdf In PDF document text
    • http://ahkjt.com/upfile/file/6777907505.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e738ce943---6387662539.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1334ce778e---xedipolid.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/63113525609.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd762673f---23786881428.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/ripifu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file/%5C/ropiwenexagazi.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/69191424336.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zemuwudesutaruwilom.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0778fbaa0c5497c3defabba05c4802bc/zixerewibesisij.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/dobibedubemodefetame.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca471a8ceb---58275061800.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/purudavosokozifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=geometry+dash+free+download+mobilePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 5512 bytes
SHA-256: ea570552b5b5126a027def9eecc9a41122e445efdb38d8d23ae41b021f0d4a57
font_01_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 11392 bytes
SHA-256: 3eacb5652c87463ff3db17c9d31783f0a5b290a121ad485da9d0bca7e22556ea

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