Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad2742cd3a3c3aa…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 21:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 650dc67cc6c9de0ba6c8eda493b1cbec SHA-1: 83856a77df5ea033a6340e6d3c075c87dcd7bb57 SHA-256: fad2742cd3a3c3aad209acb4661a3f8d422819cd55b0480a678c18298598e52b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious. The document's primary function appears to be directing users to external, potentially malicious sites, which is a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4944f4df9b9a4b7cc8188acf244d4b5e/texovogalibomexo.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/fff58a236586589443af25232b6f2ed0/33076406362.pdf
    • http://tetrafluoro.com/upload/files/wokuju.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139717ff30---94093385744.pdf
    • http://gyermekhaz.hu/Content/site_images/files/54638728320.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/dupodubalebi.pdf
    • http://year-c.com/upload_fck/file/2021-9-4/20210904170627431920.pdf
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/jumufoxid.pdf
    • http://webmba.fr/client/logo/file/kakazipipiwezisaluv.pdf
    • http://historia-bfured.hu/userfiles/file/71215674572.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f480924cbe---36493419886.pdf
    • http://escritacontabilidade.net/fotos/news/file/65373453978.pdf
    • http://weighlessthisyear.com/ckfinder/userfiles/files/bevuguzekotamebu.pdf
    • http://jeyadhurgatemple.com/userfiles/file/wikikadofejigijuxa.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa9219da24---951620385.pdf
    • http://cdmvt.cz/sites/default/files/giduvepevixisetu.pdf
    • http://nhatrangpalace.net/app/webroot/upload/files/segokifanupodebe.pdf
    • https://bipalisdemo.dashindonesia.com/userfiles/files/vetuzobutolofinix.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/maxemep.pdf
    • http://praguetransfer.com/files/file/34627513297.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/2171126743.pdf
    • https://rlmahtani.com/userfiles/files/lebibijuwarulupik.pdf
    • http://baracenter.be/userfiles/file/46875430124.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+tom+and+jerry+show+playdate+with+destiny
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 16792 bytes
font_01_sfnt_off0000f051.bin
a413541340a394efa1778978205eff9879ebe5de606a909b86e2ad42fb936adb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 17064 bytes
font_02_sfnt_off00011c72.bin
3e1f729371f4993c57cccd22cd5f76e93fb71186f789b17199e0b357488a9fd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 10948 bytes