Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a52f9149e23f83…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 09:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c750d69a16099d78585d399b0357078 SHA-1: c2f0987df4cac3c4af9928e0f0aa9cf42f9ef436 SHA-256: 65a52f9149e23f8336a05a58acd15396b6d9d6b9505fe7284efe6e43bcda29b6
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs, some hosted on compromised CMS uploads, strongly suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kapsalonvogue.nl/files/file/64779538740.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137faffefc29---rimixekaderatesi.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/zerafuvi.pdfIn PDF document text
    • https://equinox-e.com/upload/files/24301513784.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/misewozukitedijofi.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/23014568503.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/42647876074.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/21037754822.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/rapekogipadakifolasefaj.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/ritebogexotusoxepajolo.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/fisumexapeb.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/60850887574.pdfIn PDF document text
    • https://dyaa.club/uploads/file/vuzalilejirapatejekotiv.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/50233394048.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/kimudaxaxokerux.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/88767523058.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/40209177545.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/22997190147.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/60369624300.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/66885796093.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b1b33b7384243b298c5732c751233e6a/vojar.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136959b8d8ff---sokiru.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/97340212331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=install+app+on+sd+cardPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/ginevinij.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_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 18388 bytes
SHA-256: eb87e20da66fede3f67fdd9955916adb1f78b86e3ac0556ec4598498b04f81db
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 10232 bytes
SHA-256: 67e10fa25bfc88e0a66ea5ff0ca900767f9513a48ed52872d661e78f66d3f2ad