Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a2b53e0a51afcc…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 11:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12b283b699993d4324db70971003f50e SHA-1: 4c1a3e24a17b1dce5c8005ad5fe7f9ad2ba0a3eb SHA-256: 84a2b53e0a51afcca4ee52bfa7133578a8af636b24357c8876a5728222952885
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URIs and is identified as a link farm, likely intended to direct users to compromised websites or phishing pages. The presence of multiple distinct hosts and disposable hosting indicators further supports a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://nomylo.ru/uplcv?utm_term=dragon+ball+z+tap+battle+english+apk+free+download PDF link annotation
    • http://duef.ru/public/file/derudivukupedipazitek.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613441f44b003---27177418746.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefetedovug.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/59409006168.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210909053704_a2h6ym.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901140627583042.pdfIn PDF document text
    • http://etkenkalip.com/files/67906682884.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/vubufikixapekapejor.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130f648c72ea---84695569089.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3464d177---zuteku.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/poliwumefekugijaminomab.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/56522023391.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/17500606527.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-06/2109062245220890151gu3d9y7pi2h.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/xanopidovajanekew.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/ragazuzuleliwuraxezen.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fetokugexome.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d32453988d7170a966f939b1a1dd5093/zolexafot.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/dipazegisarofipujedos.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/59513527208.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/21532707841.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/ropuvonado.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/wasugopasumig.pdfIn PDF document text
    • http://bulmarconsult.com/files/98282061175.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b7ce20d92dcd19dedc5ac9c03b7f7f70/17378769602.pdfIn PDF document text
    • http://regcureguide.com/files/files/48585665879.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccd7ae524---5194730795.pdfIn PDF document text
    • 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_off0000c1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E9 11156 bytes
SHA-256: 5fafc6525d7264a2b9487f17fcaa36378e1c3643aad62d4fc2bbc365a984eb35
font_01_sfnt_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 16728 bytes
SHA-256: 3cfb8cd75befbeb28d11d3e684d18c4cf5627f9d560553d18e3d09393181bb3d
font_02_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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