Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12761af74636434…

MALICIOUS

PDF

111.7 KB Created: 2021-07-01 22:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6bc96db51c6c31115ab02b3227588fa SHA-1: d6855f6e37e597b1aa1556e195b935fdd86e94ae SHA-256: c12761af74636434f56d430cc9fa39ec5c2aee52011a557988d44658583865f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=funeral+sermon+for+murdered+person
    • http://sequirk.ie/userfiles/file/lukanaso.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fcf9454866e56f7697a88a7bad49d661/28850456774.pdf
    • http://sincaremedicaltour.com/js/upload/28258898640.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/97867900537.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f27dfe91e8a078f4567d80ebd1112a93/22875756.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160acb1e06212e---xutedoxenemenozebobi.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f543a590b6---53232172929.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607463c74af91---tiripetog.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/kugexofusafizirusuv.pdf
    • http://geoplan.su/userfiles/file/xodasoluvutadijugikokog.pdf
    • http://extintoresorigen.com/images/editor/85862485963.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da3d7595b8e---25486398549.pdf
    • http://nct-vn.com/userfiles/file/fisopibabitobabapigitik.pdf
    • https://armagedonspedycja.pl/files/file/9469987663.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c301defb---57017811632.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c5769a07a---sorifuboniduw.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/58352472778.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bce485dbb281f53b03faf3081dfe7f52/pileguxiwivibibutuwota.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/pevemakoniwi.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/91ce884f43d8b7deedac34a55ad48241/mekevolatavoje.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/pubipekosinifelabojebow.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d143da920---zezeluwemokofubituj.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ne1fctgaosi3gs2bsb028ja72g/bajigunotibuxesirofusiru.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f8321a95859ae0eb099879119409b4ac/16590621386.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8d450c8c151feb96c1a185a1f43fb32e/14549333148.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_off0001530b.bin
a3ce34f57f2dc7b90da9f5a34d82cb029bd49471bc99a6fe5ab47c77998d526b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1530B 10544 bytes
font_01_sfnt_off00016b03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B03 16792 bytes
font_02_sfnt_off00018315.bin
e4a7b3d236f6bcfa36127dd8ba08d8aa850bd5b639065219adf7e480fccbb952
pdf-font-stream PDF embedded font (sfnt) at offset 0x18315 17972 bytes