Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a84e9cf821aee1…

MALICIOUS

PDF

100.5 KB Created: 2021-07-08 23:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dc0b88e38afdbaa7357c665ada8817d SHA-1: e34d705acb762d2a3dc1e1f2f6d79ec32d7e1bea SHA-256: e6a84e9cf821aee1a00e31ea982e6c84c0b4a0df97f094c9304ded36141508b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://alrehabourhome.com/userfiles/files/52075348693.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec1cd1e22e---lewovamuzisuzajodaxowased.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7ce0e435rb1v35flq25dpm0i07/34735855151.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b16cf83388b---95499846069.pdf
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/lazatigesaxogopoxazo.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0393fa22---16663251382.pdf
    • http://bio86.fr/fichiers/jilovotasidile.pdf
    • https://zold-kommando.hu/files/20766625439.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2719ea68e2---jasejanawev.pdf
    • http://ceskylakros.cz/userfiles/file/nakad.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d26d4d929---kexisapuzojuzabugadug.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b37a86139---15302377208.pdf
    • http://markone-tools.com/upload/files/zokato.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/a4b6b5289bee64dfa847c1254affe2e0/60442429383.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1c921ac08---98475065911.pdf
    • http://lhs75.com/clients/46937/File/nodukuxonenufobasajejel.pdf
    • http://basaritarim.net/admin/editor_resim/file/lomakakamusufijukevinepij.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/cs72dj6h1pl7735id3bl0bikiq/folewopamomaxo.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/feximukunarawobudazeto.pdf
    • http://geyikkimya.com/userfiles/upload/file/88250832965.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/938fcd431c17e77c540806babc8509c4/78072244555.pdf
    • https://goooinggroup.com/userfiles/files/20210622_213148.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/lu4gi7r67p4cvt53ut3rainsr5/xetodudogudu.pdf
    • http://matchedtubes.de/userfiles/file/95543129688.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=simplify+square+root+250
    • 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_off000123a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 16792 bytes
font_01_sfnt_off00013bbf.bin
f8363c9970266ab89d216e8f0e7e8894aae0ff6a93d75e3620926e35bfa630a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBF 11228 bytes
font_02_sfnt_off00015627.bin
ddb5acac15effb7be252187c8e126356ba5c2ee0aa306f8586d2d5158a1668e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15627 17888 bytes