Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4c0733e5deb9d0…

MALICIOUS

PDF

94.2 KB Created: 2021-06-27 06:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e43fbf12549ab662d0a3325f76ea96b0 SHA-1: 443442ae2e6c5992ba0816b23d625e04ae602222 SHA-256: 9f4c0733e5deb9d030b56c411b5c43503b6f5f7f399fb201b59890ceaf8f7695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pistant.ru/uplcv?utm_term=compressive+strength+of+hydraulic+cement+mortar
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d46337062---22439709266.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607170eb83471---58987947812.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe8f670c1---17872353543.pdf
    • http://redactron.com/userfiles/file/fuvegugapi.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a296be0e850---80897585167.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a0abe08fa7d---42368679139.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/pcik0tfdf0fn1dppcurq1ilds4/ponen.pdf
    • https://faresaldabbous.com/uploads/files/gumijemijew.pdf
    • http://furniture83.com/upload/files/nokejoroguseb.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/683a393e2f0af4c371334242b4d93411/28061424036.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced873d73e---65255845059.pdf
    • http://mgocsm.in/userfiles/file/ruzupolitakinaniz.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94de121fe---1222490657.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7d9b3d93---kudekulimufuvebanudobo.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ecc2cc0a8d5405c685736d883a066c89/metas.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5b1511671---52987273446.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4d8c39b34f1d5e27ba8334325f638176/27695630852.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2499fe6b2e---vimek.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/99dac630b89d8d37244d666bf0ea1c92/27511298743.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94949cd51b---kowumogobuludaxim.pdf
    • http://bajcsidavidfoto.com/_user/file/bijuvupep.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6c223c476---nijofipuluvuw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e87e917cd---vaguf.pdf
    • https://masukpt1.com/contents//files/rifosum.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_off0001077b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 16792 bytes
font_01_sfnt_off00011f92.bin
ca347a72375c11669d6f53ec7faa1c4d4fe166b8b01dd90db7f98d9d8ffb1fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 11380 bytes
font_02_sfnt_off00013a02.bin
ea84433ea5c4fe253a824648147cc57cc2f5544873627629b733531127766610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A02 19000 bytes

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