Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bb0f52d17c169b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 15:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 881e46ccc7ca1edbe8e0d4b673ada49d SHA-1: c4ca8cbc925e59677331becfa5ad207bb1d7af20 SHA-256: 88bb0f52d17c169b60e9e07aa7d4071248489a52d09c00be7f38b769fa8d03ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings and URL analysis confirm a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=high+quality+anime+sites PDF link annotation
    • http://borneneskontor-landsforening.dk/userfiles/file/bebedunijida.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/1974212944.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/40543754486.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/95213248844.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f34a78ab---79819183934.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/3953764583.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/gunija.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613895ca1c1c4---27562293188.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/52455485376.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/924cf51e04b346d628c2bba947021718/wosifanegedaxibekuge.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/34343435681.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/gofikikigedamariviwizedun.pdfIn PDF document text
    • https://fishuntpesca.it/file/48011768462.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38365783492.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/voremepedoz.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/50534728568.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/40361477788.pdfIn PDF document text
    • http://uco-kampen.com/media/files/60563971796.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/nidivigamapisosex.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/91922732765.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/wetuluwemepoxu.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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 10688 bytes
SHA-256: b531a9286a2307248d091957c96b8b566b306904c4f2f7d789ec0b070a3023c7
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 18592 bytes
SHA-256: f4566c3e2333901240fe5dfa85e7964166d3deedb9e16cbf7ab2082ba1ad0ad9
font_02_sfnt_off000128d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1