Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd8734f9eebd7a9…

MALICIOUS

PDF

90.0 KB Created: 2021-06-12 03:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57551f8294d9abacbe5f2e4a2fc68381 SHA-1: 6bcfb06b0ffb7e0c22cfcbb7cbed441adfc63816 SHA-256: 5cd8734f9eebd7a9dd28375ea758a1ed7cbd243946088dced8fdd49d7bedcf65
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an advance-fee scam, using language related to lotteries, prizes, and courier delivery to entice users. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://inwebjor.ru/uplcv?utm_term=sweet+afro+beat+download
    • https://gea99.com/ckfinder/userfiles/files/22176276707.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/79512396784.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668da51144---89618648545.pdf
    • http://aa-nusd.jp/pavukuku.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e5062e4f150a741f3b8bcf6cb45d6a4d/ropowuxakojekinaxaje.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a19393971---31560618907.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2ae6362e0c1ebbddac9f1f595fea1de3/tukabaxazute.pdf
    • http://diversecityuk.com/userfiles/file/negifonujitegife.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/28823427104.pdf
    • http://manajrgvaaradhi.com/cms-uploads/files/soperexivitavokudezalix.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d19dbf18---dejidasupujexemuvejepok.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v46hk5add4t7jhk3b57jnmth02/folusuzulagejawepufu.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075658f6259e---9199326108.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9kr1qf8jqcvmqreifcue74ac6g/5755055006.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00011d05.bin
0f3a67f5bd329d9d0282dfd2a0b2c68bb341cca64c32d102ed7feb3b01b34421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 5056 bytes
font_01_sfnt_off00012e5a.bin
7ca331342a610b2ded4eecda922e9c443fff58f853f28954095f5d91779bc40e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 13324 bytes

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