Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf2c35c6d387977…

MALICIOUS

PDF

84.0 KB Created: 2021-06-26 02:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21c8f73faafa0b67c9084dd3559d8a6d SHA-1: e394806806ace6e11a8d06d725e8139dbd503356 SHA-256: bdf2c35c6d38797700aa102293b50245edc5d61e29264636674d2c598170e09b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised websites or disposable domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit user interaction with these links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/7ectj02k0ubpcrhh3uq12ok8n6/bidufilavesefelaluje.pdf
    • https://tahubunting1.com/contents//files/86978052121.pdf
    • https://kermoulin.com/userfiles/file/93698247057.pdf
    • https://beaszemin.com/files/boxituxokuxekokudefu.pdf
    • http://sistersaviopublicschool.com/userfiles/file/17402798435.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tt17qtqnot5cheavdakvrjmetp/70949848696.pdf
    • http://prosquash.by/data/21881594666.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/23a09f226da27664822b63d6ec9d53d1/49785639339.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608522d2e5be5---7012008143.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/df6bc7299f90da68c11ef43e420b7801/fakesefamozidezukonebafi.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2d03f08dc---71640489032.pdf
    • https://tonwen.org/userfiles/file/10895103392.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1ea663c8---kafebojuzuge.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/85332963003.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e6a1fafa066fb699e0a6ff93d6748e8e/75508998706.pdf
    • http://stark-tools.ru/images/uploaded/33725928589.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e7b65237e---wikebebolatabopu.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f14990ece413c8224543cfa0d69f8a97/80893386500.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6042475cc3f060684902d2f190a243ce/duguziwabanuzik.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/12ef67bf34148efb1a0f594476a04005/42029098268.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63e8ffd9---45648413775.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f05ebe55---monejipidimitobin.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d022a7f9d---38132881696.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d439115d---wakipoguw.pdf
    • http://watdoenwevandaag.nl/upload/wufutifidarefigusanu.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/880745fc3d67b782d5bbe345f94ecea1/vebadakusakepasiro.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=count+on+me+bruno+mars+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_off0000e857.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 16792 bytes
font_01_sfnt_off0001006e.bin
6e2dacc8b9235ac5a071111c7dadd1d17a688fd474677aa63fbe6cae72c787ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 10676 bytes
font_02_sfnt_off000118f0.bin
08094e2dc29d905321ff05693c9c59997e92cc9768ebd96caff4c6b5a28f1c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16436 bytes

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