Malicious PDF — malware analysis report

Static analysis result for SHA-256 9991e989af46410b…

MALICIOUS

PDF

94.3 KB Created: 2021-09-06 04:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78f20e85166ba88f261dfd42cded61ca SHA-1: 370d61af92c467f5951318ffced18ce7d2369af2 SHA-256: 9991e989af46410b122f8c803d1771101da80b8ee99df9bb624d0eff64b62079
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external URIs and links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=steganography+and+watermarking+pdf PDF link annotation
    • http://ongxoanhdpe.vn/upload/files/93603116359.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5f47498e9---zelironevudud.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/da0749f9d74ab0977cb06b8b36d7baed/96732266375.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/86586963712.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcada836580---95708054749.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8c5b5b0784bcced2efd83cf23f534c02/11073485530.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/s4q5uhckptq051667g2g8de675/jotebemuniro.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/78062454043.pdfIn PDF document text
    • http://biosite.ru/images/news/file/26917775671.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5d3977d1df4eb89d4df2200354ed1332/xovalosubefatus.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/59846296537.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b14b78921d5e0ea141f1e85804f1fead/13489759321.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/joguxobal.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/15748872357.pdfIn PDF document text
    • http://servmed.net/userfiles/file/55360044939.pdfIn PDF document text
    • https://laps.pl/userfiles/file/gavapulamekedijefofini.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40320b87f---14243803989.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/05i3sf19hlc4bv7g5vdep6e5l0/98436755272.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b2f97b91a---25880422919.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/54536804358.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/worizoputef.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/49970205897.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/99937035800.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e3840ac17d8b77971f98776063d320d3/9492158210.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 11096 bytes
SHA-256: d7bac91195df73f3cd12c87d1966531a489fe978203e0a8f049814d1abecbc02
font_01_sfnt_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 19668 bytes
SHA-256: 1c24f6692283a9ed9ed1bdfc9e54a492c3b193f4bc54b55fd94fef78b8a38c02
font_02_sfnt_off0001532c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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