Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40f3da8b4ddf88e…

MALICIOUS

PDF

82.2 KB Created: 2021-08-25 08:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd8ec0318f3b3e16c024fb45083b514b SHA-1: 32423efa2b09fe3d1fc3305d73584fc8fd2ccbf6 SHA-256: b40f3da8b4ddf88e5e690464c5d671f054f175e1b90ed37fcfadabe992264540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the link farm heuristics strongly suggest this file is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://banglatalkies.com/dynamic-images/cms/file/95352786219.pdf In PDF document text
    • http://lg-palette.com/upload/files/tisudejupeluwixosufabu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//rofaxuvibewikibefafa.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202108211845502284.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/17566307000.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b82a8677d---96015843932.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/niwabuwazivezegoxuboxe.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d432c44df---gebinurovesolokujuxisiga.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/dubutuvigurege.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/8114d7e8dfc5bb7b17783fcde284a29d/41153316539.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/18094452426.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cd29460cae8---91401743589.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/kudukinurafigebubujafaro.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607885e8a2d48---wiripiwaxobo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106121fb7d87---11313145875.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j5ad3et72g405pob3ulmbr2ht6/fosawedidutoreda.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/zexexu.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/wisoferagoxikumibime.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/96553579175.pdfIn PDF document text
    • https://lapiadinafelice.it/file/99257338208.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/93777136711.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160891b0271588---wamogisase.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/37621177189.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78aceb8858---milin.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/gamemolobewadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=no+show+stoppersPDF 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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 17536 bytes
SHA-256: c362d6dbdddbeb9545e51ddc0b56e86f982515c6700dd9ec33965ecf59452e73
font_01_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 10008 bytes
SHA-256: fd1c13c04cd73da97306898817d5a47c9e5bda234e5292f110d4a5307b4eb9a6
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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