Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c081ff29b58569…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 13:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fa6621053f2cf8a941d4b3e5f509ee2 SHA-1: dba8252e6583540830a1ff9c2a1d751804d46cef SHA-256: 60c081ff29b58569e1e854ff4d5cff2118a6e1a5702721aaf007578de23ddd19
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The file's structure as a link farm is a common tactic for distributing malicious content or redirecting users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://akcjonariusz.com/UserFiles/file/79212270903.pdf In PDF document text
    • http://gjbbang.com/userData/board/file/71512043850.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/lujilakofetu.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/mamuwuxidumegugem.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/8172610995.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/sapoloki.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/kaledakalejiwezib.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wemevufedikigarudegilasur.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/burumixeduzixakix.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d59628f4503525bd03928a1638116dfa/70150729743.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jikisumiko.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/62686487946.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/24319731986.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/13487970187.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/60890545561.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/lukeziritobememonalofufis.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/78945859117.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/59235355149.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/10534422595.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ca44c890---80888122412.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/41217515386.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3b06b29b---21862964438.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/rawoxetusupa.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/12175398425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=introduction+to+symplectic+geometry+pdfPDF 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_off0000bf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 18472 bytes
SHA-256: d78bb7fadf59f3db1cbd39e98137769ad4d2f413f761ce141dab200e2c15e4d2
font_01_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 10964 bytes
SHA-256: a8d7d0b80a92f15088928772b9417bffc3abd1ec0035f14c3d43087d21368635