Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8933c2883239179…

MALICIOUS

PDF

83.0 KB Created: 2021-06-25 14:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e25e99865c718df114a28d529827d0a SHA-1: dd2917718dbb0c9ca88863e4ba5d629776fdf411 SHA-256: b8933c28832391799338d19f62f2cc586af8e76f6e0b9a60f5c7495f941e351d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farms points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/35eda67ab9344bc4cff853374e5655c1/tofarerovevosazakuji.pdf
    • https://tappowine.com/file/27704195124.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d8eb35289c758ee67a63a8353acd905c/14594547506.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0eb9c286984edbb5e5b6aea608bd0104/93577245467.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5aa077b26851523b61ef43d2c77b53c2/74463212915.pdf
    • http://rubivina.com/Images_upload/files/98315313193.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec3c82455---1225210.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072a004702b9---bolefebake.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090450781b85---togodimiwelarajilimigefu.pdf
    • http://kzlo.pl/fotki/fotki/file/76233182624.pdf
    • https://alakharia.com/public_html/userfiles/file/nutamevurix.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099f96a9be58---fapuxokogonuredak.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e1931a0ff3981f77d3a7091b1db80dfe/64457606770.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81c69e9bb---vokelanuvifupisojubibadiz.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba25760baf9---25166686480.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=my+left+eye+twitching+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e547.bin
966503d7167c6ff24e93791554e08de9e48e64a91a061a4a24dd2d85b3470b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 10588 bytes
font_01_sfnt_off0000fd4e.bin
5dd69ed20e4a9b64bb8baf968f0191d98d5c92a5a40eb22b4e56e14f15e65ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 16264 bytes
font_02_sfnt_off00012784.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 16792 bytes

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