Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bca4bfc0ce930e…

MALICIOUS

PDF

88.8 KB Created: 2021-09-04 18:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b840287f3e11a97a72dd10bd579eb6f7 SHA-1: 4b0b630bdf7b45b59d6131a51f9cf9900025b886 SHA-256: f8bca4bfc0ce930ef4a8bbe8d0defacbd2805d91981db9d6a6b700a2ee6603e5
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, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/37dad74028cee59984a5735dd1567da8/julokibawesukibitafen.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16126ce03248ad---vobilikuxakasawolu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161243b944a2fb---bavivulevizumovaz.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/mipizogurekeriwa.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d87003f3897c7e403fa8d8bebbafb8b1/92606260425.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f83e15aa8---gatobedogizedepurusixegas.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbe2e8ee6c---96559722305.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/suvojedegudofowijusozevaj.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/fifezametozaj.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210809_A4961D0A7FBC6622.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/12610667870.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/55963460292.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/43k757dn5tmmmg2du0scrig73i/29669670477.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/73582711202.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb2b700e4---84658083254.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///34221955177.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/16b86c47fc914d966db795aba48ae79e/linadefevirum.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/xovirutezuxuzotipelasujar.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/070317594079.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/10040001146.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wumizodisija.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gaxejusejedij.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d941dc70---pevalogukasaborigigo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0b8690a7a---28960050787.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c03d5ae227a---totus.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2097f4ab78a0676ed5601f8e8f0bc473/zexiwofuvutobejibadoniru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+lottery+anticipation+guide+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 18752 bytes
SHA-256: f9c5a6eee314359cac27961802bea250a08c681de7e93960857a9ed96f99b6b4
font_01_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 10908 bytes
SHA-256: 1c25a9efc11913f3469511864e8240aaf6098514658d0e120d799585d0228d03