Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5523e5d4d82175…

MALICIOUS

PDF

121.4 KB Created: 2021-07-30 19:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a08fe8dbc4869c9e769749b74a74be1 SHA-1: 18b4d11367511bea727dcfe108f756d1b550da90 SHA-256: 5a5523e5d4d8217531d2c82a8f78c0b7803e509e0ea46257313cc4d551a56e9e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de3205f7c807f6ced14ec33e1c85c69b/46926546688.pdf In PDF document text
    • http://runo34.ru/attachments/file/16303420362.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1c5d83ef3b87cc5d43f0c53e46621a2e/miduwegogidebumaneged.pdfIn PDF document text
    • http://ktcz.eu/files/files/satisosevoragiwip.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/96087678876.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/11620655697.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/52519007036.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b744dfa6e59---57728775552.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9991694df---wasawilojujulesofu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2v8aenvu2c2lpgid20q0lfq1ba/14841923710.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/bajonoduwejinuwod.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050906430273499.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6dd574d5---puxulid.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210620063503.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdb7b8e4e---nolenigopiduxuvasuf.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/nenivorewesezigugalivize.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/78491472481.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4d4f0692---32320379982.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/77a3e8d575fd7e03b76f1d680939805c/46259279904.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/jixuziwobujal.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/fisuxopara.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e4cf86d76---todubaxulubax.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4d1ed92ca67bb870d03bf00e6d7bdf84/11163719911.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e9692bda---1962032667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=estudio+inductivo+de+la+biblia+mateoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000157df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x157DF 18216 bytes
SHA-256: 03b967f3d750c7847d5793ba808c84bf62fa97bbd08d1969b798edf7c6f0a117
font_01_sfnt_off0001744c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1744C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C63 10720 bytes
SHA-256: 2bb85c3195d8bfdeeca6a5b52ea5bec8649d7bf533a32e28861f195dfe068f4d
font_03_sfnt_off0001a4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4FF 19404 bytes
SHA-256: 2d9f101c288c8bfeabbea618c999e0242c965d463b35c7154601f2c23da6ed56

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