Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb844549bbb2585…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 15:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78a9e4d8d3ae6a834406af36f3f2f40f SHA-1: 5f1c456c67ac2f2402fe1947fd0cd19e9ca3b0e2 SHA-256: 2bb844549bbb25853ed53573d22fe17e7b22b7927ae0e858e928b607a68c7de2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress uploads and disposable hosting. While no executable scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further payload delivery. The presence of multiple links to potentially compromised CMS uploads indicates a pattern of distributing malicious content through various compromised web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://statewideroadservices.com/clients/879378/File/gokirobuwibojidil.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9on9bfsekd68jmkmusv70s6b13/sizezukofulinejixugewit.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85322d984---ranufarazexijano.pdfIn PDF document text
    • http://tekdalyapi.com/upload/ckfinder/files/75341219888.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161179807d5aa7---10348809052.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7cffcc4c9dc141553bc8dcdaee0b8589/36590216674.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/nerumigarokamutona.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/lifodirikikatelimamew.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210607212202146.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/51428838875.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/57474371766.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6cc518db29a82b8be1379baa8e573743/56768513985.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/tovajediz.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/vavos.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fc023335c---34907030586.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/18783329844.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922b59a5d7---21685784949.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ca65f84767f8d631fbaaae27bb207715/gajuk.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4ab763a844cf2f77d831b2ab6eb12cc5/guferewonujonefibixu.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/68510118974.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rbvlcgon8s6suhdq2fl8aloj44/vibexepej.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/ripiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=redigere+pdf+p%C3%A5+iphonePDF 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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 17352 bytes
SHA-256: 3a5aeb85910115d95588c97ecf6e44916f1a45b6a970ed6de3c25c2a5f81d572
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 10612 bytes
SHA-256: 2e2158bed1183b1be7d9b1a42f39069da5668f2a60caddb8a236f936652e0c2b