Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a376cc7645cee4…

MALICIOUS

PDF

77.7 KB Created: 2021-06-11 07:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 84580f3070d9219d2982ec383f84faf4 SHA-1: fba3daffca827cbb85a0f0cb1697160a0d844f04 SHA-256: f9a376cc7645cee498de26c4441ee22f64985d00e698c558fe519704a896610b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=download+background+video+keren PDF link annotation
    • https://songuryazilim.com/calisma2/files/uploads/93773225610.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11529340a---zekowamekoviwara.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4sg2jkejaegl1mi3h7ktb9qnff/kotifazakulemoxa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607705ef3aa0f---74584271766.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072228b13691---89696206677.pdfIn PDF document text
    • http://vinmexindia.com/uploads/48660843236.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d727ee528e---97527221715.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/kusepisuxarilazurup.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/47928355777.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/96159153075.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/vinad.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d141f2888c---pabuzafepesizalum.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/93950635243.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/nafitemidoj.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/98363541469.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2bc3d0b3b6746e673efb34183e98ce3e/11721894863.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b2d29c9f7b4e601ae1559d8b82b315c7/31505866159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 5284 bytes
SHA-256: e4c03dca333c968442ff99b71da27a489e645cab7d4093294b6e754c7671a130
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 10508 bytes
SHA-256: 1cd6041ceb10d67affa155f8a7a1adc30c314abcd8f983f3cef0b13e1fc59307