Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e528cc0af71564b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 20:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82f2d5b062236dfeccbf0ea6d07e5696 SHA-1: 29e01aa5f95998f8d9db5d966091793c55561667 SHA-256: 8e528cc0af71564bd0b8224700f85bc70af7afce5dcc9c1cedbbb9247ac8d7ea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.adoz.cz/ckfinder/userfiles/files/lufufovizif.pdf In PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/vemaperimugobopu.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d14465f3a9964f8ed06098ac3b4ac604/59093201589.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/wolifikabisevakurosomu.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/samuxabizovutula.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3341aabb0---36017707717.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/xisenalofivini.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/olni89veb4ovdsfagiid71k8t5/10898201594.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba33d985120---98713140655.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/molanusimamulasinotudiguf.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/ripem.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210803222638.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160929048428a0---34472547072.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/40f8f1e83abeb5b999cc0f9492cdb861/94524132276.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/21822819563.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758b54d2c01---sarometipid.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/1g219p3hjficu7of9a7ptaj2i6/wijedu.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/jabuvisol.pdfIn PDF document text
    • https://reniuved.it/file/zuxulinevexa.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/mlon2jrv3c6lordo111634sj7o/35463594693.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630690908.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/vetunupasexudageg.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/65832222873.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210806140215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+pdf+reader+apk+litePDF 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_off0000d1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F5 21480 bytes
SHA-256: fe31a184abb17f0858e284901ff5eefebc87e50ed720f7bd6402271a8666a610
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 10504 bytes
SHA-256: 8458364bd66e47de24cb92e0375218571039af298b179b2bc534d728de113e3b

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