Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca77817274c7a1ea…

MALICIOUS

PDF

107.5 KB Created: 2021-06-27 18:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0705d25224ee2204e864f4cd9b8700ff SHA-1: 3fded12a41b57ba3f2b58b874068ee85d5e86ef4 SHA-256: ca77817274c7a1ea6f5866fa893fabf0e079f14d920eee6a94d10e420dfae045
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites, likely to serve malicious content. The presence of external URIs and the 'Fake invoice / payment lure' heuristic suggest a phishing attempt to trick users into downloading further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://inwebjor.ru/uplcv?utm_term=formation+of+lakshadweep+islands
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d56be14c2---zupetoge.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qipgn0bm32p6ado39fug92scb7/luwafulogumox.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3498a54f7f---manelejavonoxawafo.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/flqanvkijsimd5cekrevm5m6e6/fizajon.pdf
    • http://baobiachau.com/luutru/files/35302120257.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071f971951a5---84991801565.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a645480a7b8---musavafaborire.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b40c84ae40---pevevuforezudejojasiwam.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/c4537fc2a6ff746a2a73531b5aeefa43/68420845395.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c47ad46bbe---vekiradodabizewuzafiduvam.pdf
    • https://advantagelic.com/singhania/downloads/file/34419628324.pdf
    • https://isosklo.cz./uploads/lelomolojewixigowibakul.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095000f09e14---dowasatexexako.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afd80e024037cc72a157e523b0ed18d6/vofazatusazetugosopanam.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k468q1ne39d9n6ck46u9su0778/3382275996.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8mfv38h4rkgd6aahder3jrjk1/21119737963.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d238aa87b---vawodopuzetepu.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/93384761529.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/7799061908.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/egn3ee75d9jba7r5usoosibqv8/43732018758.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c6d017dd93fb00c035a86e0e56b0a9fc/90299178310.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718b5d90851---24626761538.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/pvkb4vnd21dsmjf519md44tgi6/pokomibejibifusizaw.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/4b9f0a269c277ce77826351315d175e6/sulaku.pdf
    • http://uamarkets.com/images/file/sozaburufotamuge.pdf
    • 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_off00013d1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1A 16792 bytes
font_01_sfnt_off00015531.bin
ff9d7d76f45d48cef4d0851f4be6fa8e0019582735f28225900f0381cffc5aba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15531 10916 bytes
font_02_sfnt_off00016e45.bin
3a7aeda995d9d056df10c1f5c3fb9b3c36fe25f17461010a21aeece8d19e6c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E45 19500 bytes

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