Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb5527861620048…

MALICIOUS

PDF

92.8 KB Created: 2021-06-26 02:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1b7e164aa2db8a97e23165e0080f749 SHA-1: b86005a5e66c03c3a42222e31bcd29667f4450fb SHA-256: cbb55278616200482b6c8abb30b1ca4873c86708a50b3867572bc3011b4c856b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful sites, likely as part of a phishing campaign.

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 https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6fb8fkt8e8qi1o9jti11ltgob/80641421845.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4724812783---78536888731.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b0ebfaba---naporofalisufuwofeso.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/fezikonedugafubovigo.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c2146dbd3d3---pelotedafebuvojami.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2207ba3d85---4342256809.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb0f91e662---nopazogore.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/acb6df2f51c7be0aff34714c99f51aea/33641981281.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a3ba1861d---80734839768.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087d2f904d7d---5725645857.pdf
    • https://unosms.us/userfiles/file/kivemebajaxarekiromekije.pdf
    • http://shinies.ru/img/lib/file/72529694040.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15662d7b7---zasadezunopalokab.pdf
    • http://kochamsushi.pl/UserFiles/file/57211635175.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94c91e9bc---saferojugaluzibugagef.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/26a10c3fc6eaca259529d515a7d885f4/96970035128.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13f68c9903---8887106994.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be66536d034---bosapemirukenodonidobawoz.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91ea0cf4a---54099750389.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7br95jdgb7opmog8b7lgf2b4gi/52145011131.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/37753718406.pdf
    • http://midel.me/userfiles/file/nixuneluxumewisi.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3adcaf57e---tejowonekuretigepa.pdf
    • https://amblamy.ee/upload/file/37499832136.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a03d6510---26840020754.pdf
    • https://addsfly.com/userfiles/file/17741614992.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=examine+your+conscience
    • 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_off00010769.bin
f1f44db46b8acd5fdbb8173493056c41421aed9cc1328cfebc68fc0aae836210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 17428 bytes
font_01_sfnt_off00013456.bin
cf4f90fccd8464320806bef444eda74b1355f43efa503508a393c005b579ee3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13456 10544 bytes
font_02_sfnt_off00014c5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5C 16792 bytes

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