Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a82605cb563fcc…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 19:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0704fbef9569dfc3c2d356e2a885887d SHA-1: 0745a54752572f2bbcabed5f5aa3fe87abef66f1 SHA-256: f0a82605cb563fcc0d5fe05587475133539812b04fd27bc0426a10dc1549c96b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content, such as phishing pages or malware droppers, designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=good+words+that+start+with+e PDF link annotation
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c28778097---kepetabowudopivuwupe.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/gexadedonetawezife.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/2789155388.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/67636002171.pdfIn PDF document text
    • https://actorconseil.com/files/file/8505092416.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/41495162494.pdfIn PDF document text
    • http://vladekoservis.ru/files/padafisufana.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/3452ae27eedf2c5723a1c2501a29acbf/fizovilutexinovinureve.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/tiwejor.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/89753b44efcce744bf8bd207d6050cfc/xumomivofagusopozibuxi.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/62461332275.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/gisevur.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/37156770598.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/fegowokam.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/fukoweboriludamojiwet.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/74245256616.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/wozimuradavak.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/oddmo3ul2e6c6rk1m7idb77tp2/digotulukemutoniwofira.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/83468871892.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/94252673929.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/jenok.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/45842328144.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_off0000af8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 10320 bytes
SHA-256: f91464fe052044a3f624ed56be8e6d780cb28fe3aaae856276f9823fa8ae4523
font_02_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 15628 bytes
SHA-256: b03b4c21a14f8290d1fd4eda4319ee86c70f928e6e5875b1e24dbd580c217845