Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd98259a4daa3ecd…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 19:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff79d75fbbd5ac7e787ea85053e2ea1d SHA-1: 0f7d1191b9cba44d54f666fdb3bb8ac27ebc2e3c SHA-256: bd98259a4daa3ecd3cba0f8fb07e4c557db6f8857b591557c3577ea238f071bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to domains associated with compromised CMS uploads, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc102ef256---ragevemizegilod.pdf
    • http://aranykoronakft.hu/userfiles/file/xuvatitimubuj.pdf
    • http://optikametuje.cz/userfiles/file/lisiborilimodem.pdf
    • http://alexlunacoach.com/img/editor/file/93777536387.pdf
    • http://tandartsindex.nl/images/uploads/sugeposilitowosogera.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d6f30ddeb33b6e19183ec73f4d55a88f/11265641572.pdf
    • https://asset-books.com/userfiles/file/karateduwo.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/29a60c7b652e84c2ccba82cc7fcfd743/gewoxikifis.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92ffddd4c---11486252394.pdf
    • http://sport-way.ru/img/file/14169864966.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/8qt4ap2id90rdgol97s32tc091/getodadexiboxosuw.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac2d65e25---vinorusopezerobew.pdf
    • http://beiwendq.com/userfiles/file/watepun.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b09c627fc41deb7a7f532ead6a20fff3/zinesagatakedodovisa.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160839eac4c9e7---rolum.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4663c59a4b91aa41941456bcd548baff/17777313633.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcce3704af86bd09516acb099c95c57c/3218319683.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd94c4c5f---fanoz.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96036f666---tatonatupubedidokulifoseb.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24f4424110---zobumapotinawaruwafewoz.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb817a899---6205103614.pdf
    • https://aplusadvance.com/naver_editor/data/file/38903982754.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+answer+what+are+my+weaknesses
    • 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_off0000f017.bin
c6084149af681b776591b390dd4b73006328ee7ed83d75e48828a7c864927f3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 17588 bytes
font_01_sfnt_off00011dcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 16792 bytes
font_02_sfnt_off000135e4.bin
03aedb203a2614d4ede124b9c9fbb916c1ca0a376ba05025d2c6b7631a1acf59
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E4 10516 bytes