Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d58b7a21a4dedb7…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 02:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 332eeeae874f040001e0574f14fd9872 SHA-1: 16dde72db38f32982e29c4e600c953d477dda7fa SHA-256: 8d58b7a21a4dedb768a0527652486bdfec1d151d23eb8a0d65a3910e8eaf4c8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://barudan.hk/UploadFile/file/20210530165111756.pdf In PDF document text
    • http://divapharma.com/uploaded/file/feboxelowuxakozazoti.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/56109569421.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2a2558bc---9227714011.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sufotusebowog.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/75165352833.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609496f062743---kogenisoxajopobub.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/77959ed5af007e8a22099362a4741790/nozikowategobad.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1738534c---1814918386.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/mesuvunevawasike.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9atsudiln31frjgkcdnolobvp3/koxamufixodawu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a92e8bf47---12676562153.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/soxuluxorolesukonina.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/52106776270.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a677986d6d5---41327235362.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458dca0402---12086262197.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d9ad0c16---41972373834.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/79b46f143cc1dc5a2c8db7323408c8d0/tabaledudagebe.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d1891b75a22538df8100d37ecef09718/vewawipitovam.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/c23c8e1a021ba8f08b58871da04cd4f5/rizudifagaxuwi.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/32231973337.pdfIn PDF document text
    • https://esz.jp/img/editor/files/wojaluwisuruzetufigikosox.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b58abac18ee---1931236843.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a815187a13356fc58919215ddc903eb/72192097399.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/nusowivodikejipubun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=colon+polyp+was+sessilePDF 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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 10276 bytes
SHA-256: 58f62e9df5c996a9276086e7f9af7dcb7b9b53402bd970846700fd15c12325e7
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 18892 bytes
SHA-256: fe33d8b2cb0f1d0ac1db49073b51c1b0bae306db9d9cb1c7382c306b323afc2e
font_02_sfnt_off00012b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1