Malicious PDF — malware analysis report

Static analysis result for SHA-256 282eb9a9606359ec…

MALICIOUS

PDF

84.8 KB Created: 2021-07-10 01:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c073fd93131dc2a52cc45b3d7b0c9585 SHA-1: 9900ba0f4eca4455d57753ccf2be8fe832ae51cb SHA-256: 282eb9a9606359ec7209cb377063dde8e08c473907c026510448b9d935f610c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. The document body is heavily obfuscated and unreadable, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd965116b---fuwawifilamejazixu.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da32155a73e---fusananefuwisukum.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888eb9291b1---fezikilogoriza.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b752ed90f04---gowititugemivemuwataseko.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092076debae1---zonobak.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998694b5da1---dijemulozomevadositepime.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0f59abb8---62110369590.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/a66f7f68bcb9c80d4cfdfcdf1bc1e183/kinunozonabam.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/a9ih2em763fubcp5j16emadi1s/kadonamiremetanod.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa4f351b5---77024122038.pdf
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/78490989777.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/52034270744.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/midapimuwedak.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076045f00a4f---zometegupafivakujikod.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/53664346101.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef23342dc---litafef.pdf
    • http://scales-center.com/shop/fck_file/file/refuwarowowifibekiruwol.pdf
    • http://namuvaldymas.lt/userfiles/file/94537950725.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e40156fd6---90023289580.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/fusamifurukusefi.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2451c4b86c9d37149a454454148f9623/kisigekujuxusimumefeb.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/kotalogopubasepi.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0b84ed850c143fdcc34126942b28c237/dixosivaje.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9001a1d60c7ca6ee38bbd27916da8b0d/fezoros.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608784bca7a58---87049479220.pdf
    • https://aawyx.com/sites/default/imageuser/file/15357463853.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=menopause+and+burping
    • 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_off0000eb30.bin
c04f6f6b3a4d39aab6d39f02f8bcb17e4c01b775b19c0e1c60af40f09176b648
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 16428 bytes
font_01_sfnt_off000115b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 16792 bytes
font_02_sfnt_off00012dcb.bin
9aad7fb829440629bca0f71f15cb93b8d4e920a2d32398ad1c053e553d9b3762
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 10656 bytes