Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc8c90807e1af27…

MALICIOUS

PDF

82.2 KB Created: 2021-06-30 04:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b9da309ac1b3a65388ba857ac7fcda7 SHA-1: db8a14fdbba70e3f64ccee2804d29c4a59c99864 SHA-256: 6cc8c90807e1af278789d0370c8c463a1a48d2cfcf0d2b5dac5597aa5a9722a3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs are designed to redirect users, likely as part of a phishing or credential harvesting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a7da1a22432---19068056858.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/zetefafuz.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/10748162353.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/69085317285.pdfIn PDF document text
    • https://bloomeng.com/uploads/patupif.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5efa40e7---darakabapozipes.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7be2f5d1---laveruwolujidi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdb92454ea---filafijigozizi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094fa6202d3a---dixowiwanojumamixigun.pdfIn PDF document text
    • https://master-service.ro/images/file/jopeniwezevububelazu.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b3ed93b5---wadoladakogotemavoj.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093f38f8904b---28372396441.pdfIn PDF document text
    • http://poorclarescork.ie/images/vireru.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/cabebab5d743c4229f30e639654887a5/dusubovamifex.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/gadapeguwukogitotovifesir.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/53376769927.pdfIn PDF document text
    • http://land89.com/ckupload/files/kuzaparukiriwivoxagugivi.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/zogiliratonajat.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mewujewobiwi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba10c2d2b---ruluribosasopixidugenu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/86756876499.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/1227838969.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b889cd244d43360a1f258b3554b48d4a/situlep.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d985d80f66---vezobunedudi.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/61108971694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bye+bye+for+nowPDF link annotation
    • 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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 22932 bytes
SHA-256: 0a788714d4d3fc9b300e172d49a863a7cd114ecaf77c8146cdfcd0d7b4e15ea7
font_01_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 10032 bytes
SHA-256: 041c325beb61de2edaff1f353b1cc42fc8b355fd9da1dda621562f504db6b733
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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