Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d4bfa30a45a42e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 15:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef59dc6b545438ff76ed7e5c4bf3f913 SHA-1: e7cd0da9aa29709bafed7d18e966c446e71c8ce2 SHA-256: 97d4bfa30a45a42e1b4b2d931925d9b93e97a7d367f7a149348204a43547cb74
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lead users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.tsahimmongol.com/uploads/images/files/semulipuresudozut.pdf In PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/9365461518.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140943cd4fa3---85567576570.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/vabepepukegeserapalenona.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4228359bc---mekomadalinapoxifupoluli.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/12423950778.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/89176964305.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/45301001428.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/99351426997.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/62963471392.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109082156428778.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131240ee740c---44648460536.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/mozaj.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/lokavegatabiz.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/buxumirojeroxivig.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5286b78367052b973be1d971f25bac76/19669707013.pdfIn PDF document text
    • http://video-cycling.de/files/file/27950896238.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/wugabofutuvunubisuxa.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0e0560d17c918132c87995ccbcfc6732/25264536696.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd68879e0---lugowewudil.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133497001f84---sobosesuvo.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/nojodumodoluwugupa.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/wozodorotusibidinilegu.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/69035701588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=java+paho+mqttPDF link annotation
    • 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_off0000b52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52B 17636 bytes
SHA-256: bba28a7a8626bc212fa11e802fb1af0245161ef15bb02b3a75b5c331ed682b2f
font_01_sfnt_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 10076 bytes
SHA-256: 0e4a6c80c514c8b414053539545f4a41f33534edaebe88e69234db9617a5ffd3
font_02_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1