Malicious PDF — malware analysis report

Static analysis result for SHA-256 86065349e1856217…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 04:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d0f85964d26612282f0ad087c9568d7 SHA-1: a6379e51328f07fc1ebc5a30eccbae4afd1ec978 SHA-256: 86065349e1856217eb31242d8a2a7ef36827cd12a9a69a86e3ba0f2a8d086104
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm. The embedded URLs are likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://slenderclub.cz/ckfinder/userfiles/files/kavilizozolunamogoj.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f9ca82b76---bakewurufapefi.pdfIn PDF document text
    • http://m2m2design.com/userfiles/sizexomisanumedogup.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/bobivek.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/43771966555.pdfIn PDF document text
    • http://mamitobe.ru/files/file/23014603593.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/67502745505.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/03e6dac76be468bcb89ea62604d80de6/77844227113.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c78bfac9280---kowuritari.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/44747059149.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/40579533157.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c888ec34b2e---guboxugikodonosixevi.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6038d46a---beridexanoki.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8808bb2d596db2f2ff358026dc397dba/85225788767.pdfIn PDF document text
    • https://derfo.info/resimler/files/36432774405.pdfIn PDF document text
    • http://susutour.com/userfile/file/37096753808.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072b4ce49d5f---43334662556.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/lotexevavobo.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/jawigumumedesemek.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/jorod.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d804cdcf0bd---pividogedizimabava.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b2b2dfe46---zajuzejazekiwasusiwuxex.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/gefitisuwefitusokofip.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5753cf2c8a---54717108995.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/63679568178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+jollificationPDF 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_off0000bb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB15 15264 bytes
SHA-256: 7d89605a03a6669ac6b3956a828dcf85141780f8ab65e10d6af41d7bb214d464
font_01_sfnt_off0000e16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 10368 bytes
SHA-256: 3dad81e722662527932976d3264b395c5a4981792f2886c4a9996093ba0ef57d