Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b38b6f738a217c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 00:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a28dae9ab6df82aff3556d5af619756 SHA-1: e395e7456510ad9b06cebcd6487a3f0f583eef5e SHA-256: c6b38b6f738a217c566f8858e253afb7c20a6273c3efd3faecf188f138a7b12f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The presence of multiple external URIs and the overall structure suggest a phishing or malware distribution attempt.

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 https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/02o83186d95u7u14oend45m8o2/31495223742.pdf In PDF document text
    • http://bliksis.ru/userfiles/file/kalirapowemanededifeku.pdfIn PDF document text
    • https://protrialse.eu/files/files/19651433334.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16124ee1394f2f---nulemowazujalajutuseza.pdfIn PDF document text
    • https://laps.pl/userfiles/file/xutotosame.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/vaxazudaduku.pdfIn PDF document text
    • https://istanajp2.com/contents//files/popebodidegezebuxitebexa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e944b2204a6---gapibimil.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/en897is5rlm2en2jtmecjeprk5/66667673637.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/1345058490.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ffbfcef13---84997647099.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1f3a514b9db470c37f6ff56c8029d15b/kofimemuxadokin.pdfIn PDF document text
    • http://epicridesnepal.com/files/31699516892.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/71177626647.pdfIn PDF document text
    • http://fittbikese.hu/files/file/89199522867.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/59214070448.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31d2a8074---8632748816.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/6162556362.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/dopetog.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/39601236517.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/73192190500.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f1571973---680791588.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/cb096e056c27bcf6aba37c0368e35ff8/3234604172.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b844ea8d9d6---44876097580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=windows+show+ip+routePDF 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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 16916 bytes
SHA-256: 1bb8438cbaf9da2e150e4f67cc49cd36522cfa6320a93f76081870f7370f1b38
font_01_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 10460 bytes
SHA-256: 8501eee9cf522f055af5d7a6c57683782a3eaced435e52e7ef2181c433846c73
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1