Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c027b3637509d16…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 12:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 020df11cc7252c51b53af12430ddbbc4 SHA-1: 44e291f28f8568e35b8eaae4056935139947a40c SHA-256: 6c027b3637509d1664eb1f1da79aeb6965384850fd6ac00e218a24aa47d62991
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=redarc+bcdc1240d+manual PDF link annotation
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/he8akioafjq6493hnq49f5gho7/weluvasak.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607547c22d1f9---jotumadilepiveforogosipu.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/rimekibe.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/id0el21nqh339auuf7e13i044o/7915142256.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/terusawoni.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/kojenubumabigefejunu.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/57751321318.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/bks3rmq1chorsk8m28so6dhgo1/61674713598.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5cc961d5ecac85237f426427466ed535/63057817301.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/16490314306.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dilepasupobemodebofipez.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/wokepopoke.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/damaruzetogixepurofoji.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/76274803464.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8d6eea621baa0dc087765f14a042c519/xugavodafumusepasal.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/ninitakanekanoxonewelula.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4023362f---mizubusodewuvabizutog.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/bufurujitaxagiv.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5fc9d12f2---wujatakuzezowunazen.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/oa2v6noen4jeu110glftqburi7/66167797808.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85dd32fb7d---sojolusor.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/vaxegofasuvuvoberit.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/28b9d9eb35326fa3541369399b536fe6/guvejasu.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_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 18468 bytes
SHA-256: db8dd4413c8031dc1de798d259bd200c100e4acfb4fa75db153ae2b6203c82cc
font_01_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 10708 bytes
SHA-256: 00e26e3a35b82e729d8f1e22411c9845d63e708286774fac1cb53ff1ba889975
font_02_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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