Malicious PDF — malware analysis report

Static analysis result for SHA-256 4621a9ecddda375b…

MALICIOUS

PDF

97.8 KB Created: 2021-05-12 16:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9ed05353dd6ffbb1ab446649fd73321 SHA-1: 83d9ea841f349b055f8825953d478faddae7973c SHA-256: 4621a9ecddda375bf954714d11aafa19100c9637a9d96b3ffdee07863f221915
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect the user to malicious content.

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://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/953a114876260e7d96070cb3c119d27f/modigaf.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/f5a20fc233098d1f32eeeb678c5e61de/76091937203.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98f50e340---4169122309.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/flsmhg9t5q67756tpfbkurvk9l/83604604991.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d80e9cfd---vosudakok.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcc2ae46c4---66453945341.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ecf11e4d---75118160220.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pep1goatkgqs68hnbulofo950u/48619951450.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81894d4ff---ramanugukurepi.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/e0suept5uqrmmjur33bmvi7cg8/5958955529.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7djafbe728mnr8hep8cod23k6f/bekuradijabirolekefi.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/61745613003.pdf
    • http://files.ibiza-ferien.de/file/kobopixidavijisopugufowom.pdf
    • https://imagebeaute.fr/userfiles/file/31560419502.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/ba22bb05fed846423ddd47cb2587367b/67701024080.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1ffce5d7---3578816065.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16090d79b7a853---fejowawomap.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b43b77280---27600737806.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2fb3ea337---9660079614.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bpss+security+clearance+form
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001414f.bin
29ed87c8b1a2575211b0415907e84d17ca5e648e5e0a52f2702d9f29fe608b22
pdf-font-stream PDF embedded font (sfnt) at offset 0x1414F 5312 bytes
font_01_sfnt_off00015359.bin
aea1344bcf7051455351b914736a3e3f85ca3629e227a203122963667c18beb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15359 11528 bytes