Malicious PDF — malware analysis report

Static analysis result for SHA-256 56949b98995e361b…

MALICIOUS

PDF

80.6 KB Created: 2021-07-10 07:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a88dbc1e7a6bc5248d6684c7632992b6 SHA-1: c929857d6618b712874abeb9a0c09bcb899d3e4a SHA-256: 56949b98995e361b303ba8168d2038b1c915a5ed1c497418394c73c64cdccbe4
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links are consistent with attempts to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tort-art.ru/userfiles/file/zixafulikimuzusejidutejif.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/65fff856fba43a5c90ce85dd8bf83854/kipijizogudodevokanuwen.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/38d85639a47eb1ee8eaa2a6db3f5f9bb/tusebudazi.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6ba5d715a870f6341bcbb65c5c9aa0c3/51184589137.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210702125140.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/17289856073.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/laruvizosesepogat.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e73871682a---wukefojemifabefipimuwipom.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/98508523999.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34620cbcec---vuxejezomoxobuwidoruvakog.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210610054506.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b44a4fd08---90646739176.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/91cbb3c8872ddf937aa73041c72eddd9/6874673754.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/4e4cqq0d47otghq4h3epegpfb0/61940197293.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/6782541447.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70902170e---vimovoj.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/94996536390.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/pekoginew.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ac0c4536c---solije.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xolokuzi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a21137523---41397586721.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/62814560416.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/67712082825.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/109e7d45a4e792057b0b9325d0038ae9/58012425651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=divergent+ar+test+answersPDF 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_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 17444 bytes
SHA-256: 75a7aeaa4dba970a1fc67640368a997e984adc328775f2cec6eaa1185dd442f0
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 10268 bytes
SHA-256: b5cb4f84dcf92835d640d4624d554dc7e630021187ecc6e342f3615f84afe45b

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