Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec280664f9acc1a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-28 18:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3f6d22d81bd944740447a06de7b7e289 SHA-1: b976ca528966363aa73233e556bfedb9afec19f1 SHA-256: 8ec280664f9acc1a7cb5003dbc3959dc9490328eacb343f92d803381b91c47b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=what+happens+if+i+hard+reset+my+phone PDF link annotation
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/jexuniwejifajubageda.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/zexawoxise.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/51263641282.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-13-11-04-10-94.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/96122733451.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/gelop.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/45768536699.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/91787248645.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fccce5555d64a74153e1fb43e149660b/wogadafovimi.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/46109205613.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b02f8d7539---sebivagajexi.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210916/files/20210916222151.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/vagepu.pdfIn PDF document text
    • http://ktcz.eu/files/files/kopamemufexu.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/dozusipawadoduwaneg.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/kurajopage.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210909060958.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/339207305.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bd5b333841543f4f5a12cd253dc3ee04/97480428452.pdfIn PDF document text
    • https://termofriz.rs/files/6460827264.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/nugatoxopugesopug.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210901_F8899F95F16D210F.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161373670990cf---valenotunimajelafitiki.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/fukodaseguji.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_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 18416 bytes
SHA-256: d213c54543eecd1a9c535a71e7225c42370c606027b35845e17f9ebca5cf8e67
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 10824 bytes
SHA-256: 81187f3eee6288fd4f43d6c668701e52405f3c8802ee903ede0d3968a9c5b1ba