Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83fc3d3d1ec7afc…

MALICIOUS

PDF

80.4 KB Created: 2021-06-19 03:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 454e1f1581dcc0e063b1238979c2a1ed SHA-1: 8fcdf6f3d16a9573e5e4208968d16b4c368b156a SHA-256: a83fc3d3d1ec7afcf7be7892da03359265aacb7d70c2c27c857f6683ea403f5e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab82cfe7bd0---jezamegunojelobunad.pdf In PDF document text
    • https://likeevent.it/writable/public/userfiles/file/gigixeniposufofat.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/05125ff0dfda3174e5e93306ae897fec/3354843994.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089d94e733d1---25445471943.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ed369b0c85af0a9e4ef21fd43080b6cd/gemasitu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9efbbe1c---fudapat.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/05db9b7b80fc5a466a53991f587f29db/45570053737.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vugutebebeverumidizonex.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zenorime.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file/%5C/tuwilubalumo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e67b3167cd21fa859d0891f972dfc086/65600032882.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xepef.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210615_142625.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3e5cc85fa6f7cdfba2c3f410cd0c50a3/nelekixiwabubelogulu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/96036216763.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/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=my+lecturer+is+my+husband+ebookPDF 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_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 5488 bytes
SHA-256: a093fec239dd2125a206f94456e4c19383d902f070c616f46eda072d7081d08b
font_01_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 11008 bytes
SHA-256: 9e522c67dcadf3821aac5badee16fb64d83d049615b72bc648f87b11a2d5404e

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