Malicious PDF — malware analysis report

Static analysis result for SHA-256 293144f3257fab6a…

MALICIOUS

PDF

70.9 KB Created: 2021-10-04 02:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 152f59f37ef4e54fe9910ee5421c52f9 SHA-1: f267ecfa932b3a7d4ddd1b5111acfa5f74453fed SHA-256: 293144f3257fab6ab20dc53cf5f8f5be312bda1b19600cc31c49338252212f9f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://integrotech.pl/zdjecia/file/zejeguxuwogunuvipamonebu.pdf
    • http://cn-polylysine.com/d/files/2166351265.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/7895696218.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161511ab3b3095---55451183278.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614390fdc8810---30058048750.pdf
    • http://hytechplus.com/userfiles/file/kogavubivuniwipubuwaxop.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/49296522105.pdf
    • http://areopag-group.ru/sites/default/files/uploads/4184370418.pdf
    • http://hotelalbicia.com/userfiles/file/nirisadijawusibowavuber.pdf
    • http://pasaru.com/upload/files/266829129.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/37314042670.pdf
    • http://vector-mebel.ru/uploads/files/niliwovo.pdf
    • http://teknis.it/userfiles/files/fudufilavarogulerozom.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613450075291a---22387558362.pdf
    • http://eva.am/files/01f8402c3ba51dc4.pdf
    • https://anna-bel.com/app/webroot/files/userfiles/files/55347878626.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8e43e6814---31798627309.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210930_E82C6D8520AFD2DD.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/93570498166.pdf
    • http://joeun-it.com/userData/board/file/dijukomat.pdf
    • https://bulendengin.com/upload/ckfinder/files/75333754807.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/35401745491.pdf
    • http://midospa.com/upload/files/rotisoganigunara.pdf
    • https://sporyolu.com/resimler/files/65507794277.pdf
    • http://jenan.com/ckfinder/userfiles/files/gukikebuxir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wordscapes+cheat+level+1488
    • https://b2cdemo.tickets.com/content/files/48277218188.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_off0000b462.bin
16aac1a98c2752c423283ac7d273a78156a3ddf787f83accb10d9bae234a8dad
pdf-font-stream PDF embedded font (sfnt) at offset 0xB462 15208 bytes
font_01_sfnt_off0000dacb.bin
4ec1a2a96f228879e500b43b9079dbb1ba395fe216d53e37cf3773582196e62a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 10812 bytes
font_02_sfnt_off0000f40b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16792 bytes