Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7cbad6be77ed87…

MALICIOUS

PDF

138.8 KB Created: 2021-06-27 03:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f29d8a05ace48bd60b389f0af86cfd00 SHA-1: 73e83978a89e41b5c77d186cef0bbb7fcc8186c1 SHA-256: bf7cbad6be77ed873035236c47cb63e30c3af89be19c60dddb7631ba2cbc0714
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to compromised WordPress uploads, strongly suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fd-health.com/upload/ckeditor/files/sezoja.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2bb5ac59---powaguxinokemifu.pdf
    • http://jfac.kr/ckfinder/userfiles/files/pevuzosafarakalim.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cad9ddd1c---24862168084.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/124be339eace689bf9ca0e9430fd904a/52004966127.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/7m6qacjp10e02bf576s8fs6a94/tijakukidolu.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6cf85b5e---wazajesigiwosufalar.pdf
    • http://fernandopelosini.it/userfiles/files/48063848202.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/66365359694.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2cacbe62f3fdacfafcb963e74f736916/32303286192.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0e1906b88cd16a389860f1a556ea96da/repekageto.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/0g46oiu1lc3hbqafil6sesjil6/zotekinosujuloti.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc175c65a---netenexafiwopoduxuro.pdf
    • https://giolog.biz/images/bulk_images/files/22132052376.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee21da8016---kupiwalisupuketit.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/367bbhfe7qfjrpire0vvdtva84/tuvatisege.pdf
    • http://eiak.org/upload/editor/files/51391024999.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983922db56c---sopopilu.pdf
    • https://dollarplus98.com/images/upload/files/53636555195.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608699b9e080d---71481773657.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f308d1dfe4fdc322f5c55085b720b6b3/57263735200.pdf
    • https://mimpisiluman.com/contents//files/86837766473.pdf
    • https://arvikabc.com/images/uploadedimages/file/jobanofulisililivoj.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/jsblr1lbkpcamb6ljkn85aj6fm/57869957688.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609421bec44c4---xezikex.pdf
    • http://fmi.lu/userfiles/files/7359768473.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bke4mg6tb7bbbpi8jv0297cia3/71233022809.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=trans+siberian+railway+in+which+country
    • 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_off0001ad08.bin
5686ab48ce4d0cad9308aa1f0e1cc0c5910c688971d5fbbc293a4321f2f2b0d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD08 25136 bytes
font_01_sfnt_off0001ec3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC3F 16792 bytes
font_02_sfnt_off00020456.bin
97bf856d6730b7b985ab21a5c3113e91a3c0e240785f91a6a82134371f5b7b5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x20456 10732 bytes