Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b61d0709f63304a…

MALICIOUS

PDF

91.9 KB Created: 2021-08-17 00:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4629c99df7212dc12c0e478af3c0ecbc SHA-1: 90332c7f69e61260d0a7a3dda30b6eb50be64b93 SHA-256: 2b61d0709f63304a478d404b8f94c75058e30948532690ca5e2e5539f8c50f92
176 Risk Score

Malware Insights

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

The sample is a PDF file that impersonates a cloud document lure, aiming to trick users into downloading further malicious content. Heuristics indicate it functions as a link farm hosted on compromised WordPress sites, with ClamAV detecting it as a phishing trojan. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff05a8b8300---31088002826.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e0e4fe04412144c7751a77650327d30d/wikojafulefanosixoxabagu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03068d7e22---10007226133.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0edc264a8---wiwawowefipotefolufawad.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fijinuvexetomomonutekiku.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3c7ed92b65226bc25cd4127d8e68aab8/bilalalisaxiravatiwube.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27487a4a0b---50977580771.pdfIn PDF document text
    • https://raljob.com/userfiles/file/xoxopepavaxarikekuj.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01302ed26---lesafo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4g19qvmrmkit8pcgrp5h8u07oj/bowisajejalefawejapokiwu.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/16300898827.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b07cbb17a9e---gupijilomililalinupe.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c644c043c14---wubufojerire.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/edfck7erm744690tuceq84n9s2/natovogefisuwigubaru.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/retokenenadedi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/4vjv92hv0r651ga4gudpkeafka/pukifibunituruka.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q9um6cklm0gk030f1r927b5l2p/31600510526.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e788e213435---gotemoloforuvuvujekute.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/roxereguvagolunamam.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/reverebujataxag.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wepulomi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3a55bf16c---lenakuzejaxegagubir.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/nonujaxe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ba14037bab6---42686345219.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/poluwatera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=unit+converter+iphone+appPDF 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_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 10332 bytes
SHA-256: 7c7ae3525c45af33c33845753d5f0369c90b56190cf7cf94e549990ba4f42cc2
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A7 17636 bytes
SHA-256: 8497a952e5dc4aea9759324cf5656ecd0d3be5fb80a28a03fa45abef21b82d45

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