Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1dd46a074c883a6…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 02:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c8727bcd8ce4903c98afd0c54c6c525 SHA-1: 87d2d370b1dd138a26b462fb179d4d1afd442718 SHA-256: d1dd46a074c883a62d1200765db6906f5f1c61c85a9ef85338650c85d7fa5ed1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of multiple external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://dzbnf.com/upload/file///tevot.pdf
    • https://panificioilcavaliere.it/userfiles/files/netopas.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9a5c8ed79---muvowebadumekav.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a2ccda70---6160144681.pdf
    • https://raiporjai.com/piceditor/file/80976248653.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/c2407ae4a5ecd65e1dbc295256653ac1/xupivu.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d68d32ca294668717a0fe0190c75b5c7/16061385299.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/dc7d795921cab10349789df10d859c0f/19353880912.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe5a10fe4---kesugefi.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ghbqvo74ccjdu1qimukg0lo640/vavivijogonizurebasuwubex.pdf
    • http://sushiloverca.com/uploads/files/kagewe.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/204bebae5e6058868643e2d1a7648bd7/dovujew.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4535affaa45bf3b3cff723ac10a73d2e/99465963481.pdf
    • https://area5srl.it/file/fibajokejirovulebeximavu.pdf
    • http://ildongwire.com/userfiles/file/bosopodajidiwuj.pdf
    • http://aarogyamedico.com/userfiles/file/josomesavudalun.pdf
    • http://sarljarry.fr/userfiles/file/61357244037.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d5eba2ff1307a1c844d1476f262d4b85/pogufedadajokelawibolezu.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/brj245abcsv6rqf5ucbj7u8gpn/71436986393.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fe75ffde---96922534952.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609496950a5d3---gujagodirupaduxukusovesal.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b1f8aa995---8974772300.pdf
    • http://dachastyle.com/userfiles/file/dokofejidutelus.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1afd56e70---zetavojet.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/88394403773.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/16470925435.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=retail+therapy+ielts+answers
    • 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_off0000f2e3.bin
d2b21f4b544a69076c01b89ba584acf471a39a2a4bd32e2e16e88159892dc539
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10472 bytes
font_01_sfnt_off00010aa7.bin
d559a6ba70108b085a334987ef527d819a9cd690e1d310106fec840b2f5c3856
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 18112 bytes
font_02_sfnt_off00013a00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 16792 bytes