Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9f4f0a20120a06…

MALICIOUS

PDF

73.1 KB Created: 2021-10-02 22:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3c63076f5fb617f972b10a18265f07bb SHA-1: 0b7fc9f9d0609eeb370d63872bbebc06691dde9f SHA-256: ea9f4f0a20120a065cab034f3fcb57c11bbf7db0805ddafeec795eeae8d3f643
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, many with UTM parameters, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=posterior+abdominal+wall+blood+supply PDF link annotation
    • https://tese.in/ckfinder/userfiles/files/57446982991.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/52863559876.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/1196158305.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/14825501934.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfa93416cf---sugiz.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/9030810899.pdfIn PDF document text
    • http://songchanraccomposite.com/upload/files/40139259055.pdfIn PDF document text
    • http://bndweb.nl/upload/files/feledofode.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/89048002434.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/taseraje.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/kisip.pdfIn PDF document text
    • http://rotang.net/userfiles/file/jipikekepugefef.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161559ebf9af09---43684274721.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc30a4cdf---mujuludoma.pdfIn PDF document text
    • https://pcetravel.com/files/file/82656716734.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135219e48491---44347250175.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/58086126524.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/10797300920.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/paganoloroz.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/69886131288.pdfIn PDF document text
    • https://mmszke.hu/files/file/juvefazijozimovama.pdfIn PDF document text
    • http://mebco.ru/images/file/10906764833.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/sewikuxijenijosefulip.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_off0000b9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 17024 bytes
SHA-256: cf4a556bd7742a8e7b48e013ae4c27ca389c55eff6ff2f770f598d293d5338bd
font_01_sfnt_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 10992 bytes
SHA-256: fbc8fe86ec061068a1014e89952346df63885d5c2bf666e0fd15d7e93618e73e
font_02_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1