Malicious PDF — malware analysis report

Static analysis result for SHA-256 6141ed83677538d6…

MALICIOUS

PDF

93.0 KB Created: 2021-07-17 16:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfa1fd5eac97116a118ff93da083192f SHA-1: 0a7aab91d6df808d541453f58e366c8bad4daadd SHA-256: 6141ed83677538d641f120918f36ef10b444c5fb4fe2dfeb1bf077fd59a9fe9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://luminex.pl/upload/file/35349609862.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e375dd23be5---rovinukepenifilokomofegon.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/08gtv32ft6ii6e57a90avtsgsv/kalasodaxezasapu.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a69f91fc9d783f5d98dc24685e5b9de6/xiwora.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2b11e438---riradiruxogazegape.pdf
    • http://aliceinformaticasrl.com/user/pages/ririvinobokukavapefa.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffbeb69870---jinezugen.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0c77bdc6---86256298046.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/sufek.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af26f23a83---fijulerixodofe.pdf
    • http://simonide.org/userfiles/file/xiretekaj.pdf
    • https://saporidelletnastore.it/file/81062719720.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/dipil.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607565b6ed60a---dojobalilugup.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b5mmn2cqdcufmcthrpo731q474/83008343725.pdf
    • http://weingut-suppan.at/files/xusatutixejagukozikog.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1b3e1b50---35108278460.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc51c3fe5---33659336100.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/17e071dea57c16945cf0d8ed9987aa8f/37371607686.pdf
    • http://busanpc1.com/upload/fckeditor/file/xataxa.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/02oog4u2rvqi9ck8g427rlnii1/42447328513.pdf
    • https://soudurelauziere.ca/upload/editor/file/10203095382.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=neet+chapter+wise+weightage+2021+pdf
    • 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_off000105e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 16792 bytes
font_01_sfnt_off00011dfa.bin
7881b0e950311dca564b226658ad08a9c34584dbb171fd90852f1907f560df1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 18392 bytes
font_02_sfnt_off00014d09.bin
8e1e9ff589d9a103cc4cce0bdc0036fc0998d143cdaf53b2ce776d1f523f3824
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D09 10984 bytes