Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac59ea83a0040fd…

MALICIOUS

PDF

83.7 KB Created: 2021-07-01 09:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc7d942c79cba218b6c0bc44812796b9 SHA-1: 240d448f2586a0a7497841754a1edac9d56a1aa5 SHA-256: 0ac59ea83a0040fd655b9db9cbb33cf50bcf905074ca8d94185955c02c068dee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The presence of external URIs and link farm characteristics suggests a phishing or content-luring attack pattern. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://infrive.ru/uplcv?utm_term=nude+pictures+of+fannie+flagg PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c40e2cae1---16670610467.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/35296057211.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37fb998436---laxenodonob.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d8386a016c31a03b4eb32b67a00edf35/gefoferevevolusubadiworo.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/pagepisazivoxinexipu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2c83d411---newejon.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2b0a2be91a798868a5840d125d8ca799/20711684361.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/60740825333.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40d145c8c---30109754643.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083faddd80dc---pobanuki.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/phvcub5t82n5j29vg7sr98c8dr/12255300003.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/35507249923.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1321a2161---wigurugiwot.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ab42e70fe643bc518d4094c0f5ca6a2a/durojogabesuwupojeva.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/c3opnhqq7rs9l4oo80ge23j1bd/zufizenu.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/lowerune.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ec25c9cd---62213447662.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/28634614002.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/56148736841.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/04511a5506c3b612feab3d5e17180fc4/30466788548.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/23859096804.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/68c5e36d2a17c7bec3461991474f6702/14676531653.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076f49657504---goxiwamawu.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/al1c63a3m7s4855dklku55mmt1/gisulenetorasugexijin.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/657d2953746a95a699a398d291f1ed96/23870701310.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7d1f0dc9---putadutoxil.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/287852127.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 10872 bytes
SHA-256: f7e7daa00bfa23e3311275fec6e802d4c7ff63a17968227739ed189f596e1812
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 17352 bytes
SHA-256: cdb6f0613fc32ea8a827e5576669de09f2bba0d58919eb389a34d481db576570
font_02_sfnt_off00012957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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