Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec597e56d81ab719…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 15:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc0f0ee3e7f0a3c49ea71efe26afc658 SHA-1: 8227503250b303865e487ca2be112bec92bf86bd SHA-256: ec597e56d81ab719fb9122f669c0fc8135c6b79fae1be9dc9a97df966453a68d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://chcial.ru/uplcv?utm_term=how+do+you+get+free+discord+nitro PDF link annotation
    • https://travelworld.ro/userfiles/file/65055288830.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/72813979420.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/rusiwe.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/lokotufasugadevik.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/savamamevitipudiluzenoso.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/62198023028.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210920041739.pdfIn PDF document text
    • https://atavio.ru/files/file/pebixa.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/jefajutuvuwapodizirojaga.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/kutola.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/gitega.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/19975157510.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210916034246.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/77055751394.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/29168952344.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/rumowagipudonutun.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/duvof.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614232a59eed9---bivifedeviwonumebomab.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/medad.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4081ed9e0df74d3c8092b5dc9c851275/sedidulowedibuzuwex.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68dd9a271---31936521558.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/verelodi.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/36745874874.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/62927616847.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bc60e58d81ec2cd0f0f408b75177d75/47362545421.pdfIn PDF document text
    • http://atomleasing.ru/media/File/golabosenapowube.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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 18624 bytes
SHA-256: e3ba300f56737cbc0b05e728e5882f6e9017846675216208f598776d7842d2ec
font_01_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 10732 bytes
SHA-256: c1b824ad89840471ba9d6b1aa8c4170e66f1a3cbd659a7113cc40263fb311ea2

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