Malicious PDF — malware analysis report

Static analysis result for SHA-256 89551a4a8e7e71e5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 19:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b695dbef566b4b26be6ca10e4bab2536 SHA-1: d78cbf58f25c87363cfaf9546a36da208e90b2c8 SHA-256: 89551a4a8e7e71e51ae71e1de40f8b05a04c38ed4ffba05afd9d221be697d952
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier returned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures to phishing sites or malware downloaders, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f33016160356a3b1d122f67fc33b8e49/ronefiridisufananu.pdf In PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/vuvomenogefuru.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69cf5c7ab---44297155313.pdfIn PDF document text
    • http://baoveantam.org/upload/files/xuwakesolezebefod.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ec0dd5782---zesomorejaje.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/75984932611.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/64180921051.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/lapatenomu.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/86442377460.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/nodasexov.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210910_5FE675AAFC7C5C04.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131762db01fd---jabipigajoletal.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff6e3d26e---27190026983.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/51415716861.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/kekegabixaji.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/sunevusezafitisebevuv.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/rivoragamel.pdfIn PDF document text
    • http://elma1.ru/!upload/files/33057354183.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/mezasiribesafemagaviki.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/14111414721.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d11194cf29---kirebixa.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/32541951037.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/lekenapududuwika.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/wafojav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fifa+mobile+online+generatorPDF 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_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 10504 bytes
SHA-256: 0dee106dbbb654570a047390df25470a6c7a3d908a2ea584f60a8281739e1984
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 19700 bytes
SHA-256: dbf2e5e8c15e2f60f97aee55420345fb09af1303e44e56a6186f85242511dfd2

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