Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d3cc9831f9b629…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 20:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16f3af90ced02dfe0e36a2748ef7c47a SHA-1: dc78be762639dd83aa3ce777b0d18797e66cf4af SHA-256: 78d3cc9831f9b62954a7bc4304bd1b108c2b3c4be70c0588f060a774ffe9717d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation or redirection to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=ps4+emulator+apk+download+for+android PDF link annotation
    • http://kidsjeodo.com/images/files/fotumojetagixikol.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/kiwigumafowosadumanopuvi.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/zogibesutob.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d95b8400---nifajuzemekawubuvabod.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4c40b30b7a2be94d29ccd6150cce8d8f/rodero.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1491ed1c---70606535002.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/49164199759.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/gugumapunadaf.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/83530916308.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/mojojisus.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/levupuwapetuj.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bf84a49b---52117713307.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/25487956759.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/97997520793.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/34994188004.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e310b2951---nekisapaselefotufif.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/zususi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16145d9a208bbe---59765194928.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/40409313694.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/fafagapirawopiji.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/31443631261.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/lapobepuf.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_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 11016 bytes
SHA-256: fa19e85fc08493bfce612e9bb87f8c8986b645bdb0b5ca4bd06d0aa94f414add
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 17728 bytes
SHA-256: a4b6370243361fdcf3fb45eeca46cc7393eb7a56293e0feb6a579c6127de0dcc