Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa53b7eb17c0798…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 18:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e580596a4bd9d2fbfb96a4b8bd993696 SHA-1: 677d09e52c53f98ba06265a06416f1c79f16a35c SHA-256: 9aa53b7eb17c0798a9c87bf6f04fc81ba04e0cd0e4834a39aa28816143328df4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://pomocnaukowa.net/Upload/file/gokajiruzavij.pdf In PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/jr2d13ju4jk6equupok5raac8n/81715616962.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/2962151187.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/besowinomosidipogimezon.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/70qaikuk0u79r8m0jhg4alco2g/rovonagavo.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/38n2uc1m312lfl513vn3etn5n0/wawufunimuraderutukod.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075632826b93---nilopapuwetopijop.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41f91c7117---jonike.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/lq7gvcceb5sfpvvm72au9u9b24/90520621514.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/minegapok.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/96072174337.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be35ea74e5c---10496855679.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16070a44bbb4bd---33034042659.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9afb2cacb3bead13b0ae98544712efd6/lojobema.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/70fed74f533496deeedf034196d66835/jinaxoxatorax.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c5avbit0dokqldppdvrlhkt6n8/vodojigageruf.pdfIn PDF document text
    • https://electroagro.es/pub/files/94546395507.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/37c7b9d0f0e7df8c75f5f2cee923fd97/31871346612.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/gawirufozadudiwunekaveb.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/1796268075.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc09492abc---botanuvebiwizenadawip.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff364b2c7e---pupopixonubigom.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/dudatejelesuxusi.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/96099534417.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a501fa7397a---bukipizukorukubateregu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=most+sold+movie+in+the+worldPDF 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://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_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 10496 bytes
SHA-256: ebcccf41cd16358497a1fb96598254c92335208cec53aaa306202a3ed96f25d7
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 18200 bytes
SHA-256: 081f7fd5b3622e64677fe1c6b5f9da6be2621ad5b55e44b443f2ebb539fa72d0
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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