Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78a3b4fa30d7bb0…

MALICIOUS

PDF

95.8 KB Created: 2021-09-09 08:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0185a519c6a5f2d84d5e8be4a52e5e5 SHA-1: 7ee2731ea5bc88ec6da8cfe3766179e30583ba09 SHA-256: b78a3b4fa30d7bb052c206584d3a1471df2df5a0849a8aba899b720e19100e16
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://medvor.ru/uplcv?utm_term=thomas+pynchon+v+pdf PDF link annotation
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/77f99e05512ebff91c72fc09dbb16bbf/72357886559.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/90315445152.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/winozeg.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/67279022781.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/memozabifaponodokopazaz.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/lubexafefuzejor.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/mubibanifo.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/92139909263.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/fesimegejetovum.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/46523137827.pdfIn PDF document text
    • https://beaszemin.com/files/79447825538.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/rovexofusozosakizo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f965d8d4ac---puwaferelim.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/juxefomenerepubibaj.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/13983663920.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/87272528393.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/xanujubusifinexedaminik.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161393ea9e3b75---bopafasujokuwulutagesixe.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/24835661155.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/dedafazidesavodimujerudo.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/333f008109517aa54b9284349cdd32d5/80577446225.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/vesodijazadinavibajoziro.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356510e223e---pizitinajope.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/difepij.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/43909286857.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/xadedojazatokomazuxe.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/zujidepuf.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_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 10560 bytes
SHA-256: 1e13162c40db760f074f3a04b68da8c4778f28f32910eebdc4f9f6d885bb1ea2
font_01_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 18964 bytes
SHA-256: 06312a9da71d2c53eefbc88d2845afa81b7f21e393e5932bfabd35c4ccf2393d
font_02_sfnt_off00015967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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