Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6ba36d621d1741…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 07:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d8b71b265f3099feb35c1f730e99dbf SHA-1: eddeb5e4e756865fc7d79f3e100a9e8ec33f9e71 SHA-256: ae6ba36d621d174170e0cbf0b641d9c2fb5ae4af52da3c1c6630afc6355d6944
164 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, with a high-confidence detection of Pdf.Phishing.Trojan. The heuristic firings indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, likely as part of a phishing or malware distribution scheme. The presence of invoice-related language further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wjvanderheidedienstverlening.nl/uploads/file/43468884825.pdf In PDF document text
    • http://bagiez.com/userfiles/file/vetuvutajup.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/degafurazikawo.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/7549668673.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8f03bc60---zokepojarudoruwipu.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/pebexomixit.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a4f7f559c4bcc18b98b0578af5bd3989/kemelawilijotexuramatanen.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/62fc0cad4136255a43f9b10f2009c5d9/14354671538.pdfIn PDF document text
    • http://technocom.pl/editor/file/vusivenowixabefupasuz.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/u9r8v804e7fnmg6ttf66cprgn0/50103729264.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/2701593024.pdfIn PDF document text
    • http://schokobrunnen.com/idata/fujaratemevexadewege.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7a0a1f72---jodugidibil.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/50347017500.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f00cc8084d---xalibejodavabadofoseb.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/931432e37f29ceaa4cbf62fc3635259f/riperonibaponob.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/4c842fcc6843e66012e9c9064343f5fc/40517576345.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/32b8c6c419eb4016773a93442524c78d/sovovivadav.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/9121af2c50321676b463da57c85e387a/dusozanimidigojewedasop.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/sozagixosefu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/56a809bd15f1d4703134d9c9dc566005/9521731582.pdfIn PDF document text
    • http://ashioke.com/images/library/File/latidida.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160843dcfa5e7b---rekibaxikufaxidev.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b31fc4872db72f384f7dcaaaa6898545/16463984137.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3d927b2b7c49087433791e2c35558142/68292420331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=order+to+cash+cycle+in+oracle+apps+r12+pdfPDF 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_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 11028 bytes
SHA-256: 96cdff3a205c06ac8478a274edd6145107ed28c4bfcb6b63dcb1d331eb0db0f0
font_01_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 17112 bytes
SHA-256: a55f487c26dd4a538dc004a63d01d1d140ad2a717e10302b6cbc04234cc057eb