Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5813dfad5d92df…

MALICIOUS

PDF

76.9 KB Created: 2021-06-26 06:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2884b67dcbd389814c48147b28eaae64 SHA-1: 187777a2428fda466d193796053309d3d70dba8e SHA-256: bb5813dfad5d92df870d24827572986cd69c932a6fe494e3c9efacb7dcafbe60
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to malicious content or downloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the use of disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb7f96b69---tanibonosadikeriwe.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59f3b7f46---fadigozijejuzeroxupodaf.pdf
    • http://traviet36.com/upload/files/20397654055.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/zupub.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4328b28ea85af56f4ffe3bcb28f0be4c/58370484998.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607132422eede---ritiwunujolusod.pdf
    • http://iglozawiercie.pl/zdjecia/file/wafupulew.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608027e6d2752---leninebutukof.pdf
    • http://timandlor.com/userfiles/file/memafomosuditetu.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609025c67f3ec---31010295265.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2adf9edc9---nofujafaminevoxe.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b05cf8a50df---zebomuka.pdf
    • http://elfuklid.cz/foto/Image/file/46664890573.pdf
    • http://afghansolar.com/userfiles/file/kepol.pdf
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/99908916663.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/oq415ebdia373d3amp3cuafr61/devotugepibetonanuput.pdf
    • http://royalwedding.jp/images/blog//file/zeroripexevaw.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/571b4f2789826a2b0be315f3034d1bf2/1366643712.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/stb7qqqq3rrqebiigm81g26bju/vopekixez.pdf
    • https://triosms.com/userfiles/file/11506224808.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/0b118c734ea288982efb7e442411b44c/44942894296.pdf
    • http://maslatalaia.com/userfiles/file/juxixofapiza.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07466309aa2b691edf22da9f897ff62b/kuwuzotapuw.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/wepofoxanironeze.pdf
    • http://cedule-plachty.cz/files/file/bunonugoburogogofa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=toad+free+version
    • 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_off0000cb20.bin
e7afe07908302acc906e28fff4207e52799114ecb0aa67c3b7b185c1315dfcad
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 10232 bytes
font_01_sfnt_off0000e23a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 16792 bytes
font_02_sfnt_off0000fa4c.bin
ad1ba461afa8c9095a36696875e2b35dd1127779f5cb43f493f36db340d47f34
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 16880 bytes