Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f59f3bdac534315…

MALICIOUS

PDF

109.2 KB Created: 2021-09-15 20:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 05d07a38c91a937c439142ef95a28f5e SHA-1: 1be7ce23af89a5eae91d0d9a51dd6bef05144a41 SHA-256: 1f59f3bdac534315a9dbda395e70b31db694dab46b940c8591a04e374cf6bd79
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to lure users to external sites. The file's structure and content indicate it functions as a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/53919053091.pdf In PDF document text
    • https://fullgame.hu/uploads/files/gogomonetomixolirajuwu.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/28757343982.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382b46c59d4---51703678360.pdfIn PDF document text
    • http://klaaswester.nl/img/file/91264472854.pdfIn PDF document text
    • http://klhl.com/userfiles/file/vozoti.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76725386352.pdfIn PDF document text
    • http://debten.net/UserFiles/File/49056958522.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/selunazotelizuv.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/70954461345.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/50011834462.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/32405467591.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/bemugolizupamokiretux.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/88210195552.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613862df8721c---zitasidi.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/14722740450.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/32635931844.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/lepubejidig.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/94616456758.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/39382493894.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/101de83d104deae2a958a8483c8a12f3/22719583101.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jiwutelebutef.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/wuwuzuwiv.pdfIn PDF document text
    • https://tierlistei.ch/downloads/92737052146.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/tonazit.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/tebawagefelu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h984udpga3p86amotfd72kbdn1/kipavanore.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109061624202946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=p10+lite+firmwarePDF 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_off00014134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001594b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594B 10244 bytes
SHA-256: 32a6e21aebc4821a60810ab33d59dad77efddd1aac58e03bf6ad6bb47bb551a9
font_02_sfnt_off0001706b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1706B 20596 bytes
SHA-256: 8c5b86a14306873fb05e7c2dcb4b93ff5179a35903843003ade1242f9e4093a0