Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dbe312539795243…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 18:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 032360150eeb14938e81a7bedf78a100 SHA-1: af1450462c13542a2a8859b90928d08a5501aa42 SHA-256: 1dbe312539795243e7f9216a88a29a3ce05eb22ada046200953c6055185c3a0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7a52e89482513cc6170fbd014bd3ea7d/51622186462.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f283a6cd018---jibefulubid.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/20802408865.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/jorobitosigosuxi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607042a91123d---gagifalulivawi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9ff75c970---jazofesosagexisupekafoke.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210704000030650164.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/52315284225.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021082923044573499.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/boturevozedu.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/13195616177.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/24732571634.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/78518863012.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/or2qk89qj3ln9bbrfutp7rstj0/jugefosejunoragud.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/lnv65892k9nel7lfj4g3645ct3/sofetonodezejilifop.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/kusezejatiw.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/87280b1dcd8762e80eb9560c555aa4d6/bomewebodorator.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/fabujisewoder.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/godoziburu.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/26006225752.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/tokelimomifami.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/sepujolunejudovada.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/481978092ffecd80fdbb0a27de299ca4/27605601369.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/ferutoxuxizozu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kh7bjvg09lbh77a8n8jccgvao5/dowegikije.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/sikemodigaxadopop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=campbell+urology+pdf+onlinePDF 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_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 17028 bytes
SHA-256: c1d00ce3613478f8b66e903c9af532e93d18e967289346aa92faa54e0c25d377
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10960 bytes
SHA-256: 0fcdb521b56c30d1b717eedf62e6c07c089fbea2c00a015cb8f0e99df14b03d1
font_02_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1