Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb9c761907fbfa5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 14:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ad56d6a17f5118ef17be2a2e11b1a5f SHA-1: 93785509c3eee3db7c0b144b1252f33b1a499919 SHA-256: acb9c761907fbfa5e092cbf0b657739fdbb1f7b3289148b400ae3f84b812c764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drafthe.ru/uplcv?utm_term=average+word+problems+grade+7+pdf PDF link annotation
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4ee7044908deab7c5615c6e8d28e7bf1/39822060787.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/vusitokodulekuledixida.pdfIn PDF document text
    • https://begili.com/uploads/image/files/61683277753.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/sewogofujegizumabazata.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/meganupewonopivoxexade.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/mogefa.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/99139035873.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/31415284277.pdfIn PDF document text
    • http://imbirimbir.ru/files/disiz.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16076348e76640---26961989932.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5448210c3e---fidadoperixobuzew.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/4412103198.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1fda1e838d984def69752c6d8a138efd/kikewikenexunujoxoteleres.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/zosotej.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/rananizuzav.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7b3e122a569a3d907f925b8ea22fe6fa/92860800634.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1629517906_1.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/53207492889.pdfIn PDF document text
    • http://forti.in/userfiles/file/91613492746.pdfIn PDF document text
    • http://kasargod.net/uploads/file/popojusezi.pdfIn PDF document text
    • http://kleiberit.ru/files/file/8148010926.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d392e737ab---79631055712.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/12425012264.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/85958670454.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/44974860214.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/78960359965.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/67054069025.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f09ec31633a3ee1294f7dc76236863d0/xukorasuwironalopoji.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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 17856 bytes
SHA-256: 2346f2f878437a168cf848766c65443e0e824a16734d494d41064faea6cda77d
font_01_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 10872 bytes
SHA-256: d963db1416f9bc53494434ebd9333cc01280591f272c713caafb87303a9311c7

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