Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f64f7010f23319…

MALICIOUS

PDF

76.8 KB Created: 2021-09-11 15:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 291eef95f48d2797546f65f9a42f7f3a SHA-1: 6a11e6c8e50bb37589a41505776b0f4df991a81d SHA-256: f8f64f7010f23319866ad0545e6445228d4f228a3a644c614729623b90382f02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to domains identified as disposable hosting or compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://teplolux72.ru/upload/file/51877846824.pdf In PDF document text
    • http://belv.ru/userfiles/file/62709069272.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/momajapimudulopejavut.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/rilatumurukewagimiluk.pdfIn PDF document text
    • http://falconltd.pl/cache/file/16702322483.pdfIn PDF document text
    • http://hkalc.com/userfiles/20695580203.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/xekeliladabureso.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/7099088723.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/dojubotekedemikime.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/59593895948.pdfIn PDF document text
    • http://aromata.ru/upload/files/fagobafejilarozedil.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/dofemutizosupi.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wokikuzofodimusebawino.pdfIn PDF document text
    • http://tipiland.net/upload/file/89647903419.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109040910304473.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109010800355717.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370fc02ce6b---63858201856.pdfIn PDF document text
    • http://land89.com/ckupload/files/99280398464.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d249b74a9---radiw.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/66988921868.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905222227145797.pdfIn PDF document text
    • https://panoramabyty.cz/content/dewugipejil.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/40295849576.pdfIn PDF document text
    • https://spacio.hk/attachment/file/69977876111.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6dd2655d6---laduve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdf+class+7+mathsPDF 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_off0000c9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 17112 bytes
SHA-256: 846f02557a77def9ec93ec05ec0b605dbd5c3631b0a74c4ba130b3dd44984f18
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 10244 bytes
SHA-256: d4a5cdb23b73ca8ec5640214c51dc5d403f4659d696289d9453ceac28cbcb29c