Malicious PDF — malware analysis report

Static analysis result for SHA-256 812099c44dd077a3…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 06:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3302e67de0e035dd4d7eb49053b3e86b SHA-1: 0c7145761af11f8f7e080935e5363e77795ca224 SHA-256: 812099c44dd077a37eac030f35d4657f11722345125303a7e5b2d5a3c87f9a0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=how+to+transfer+data+on+sd+card PDF link annotation
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff997b98c9---27218060718.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/52470559122.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/wobigilirifov.pdfIn PDF document text
    • http://mdtrend.hu/files/file/65432451661.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/makajidokepoluj.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/55613586881.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/kevorebaxobowatupuxuron.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/47430109138.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebabe21c41---tugiguzugufuxurufa.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/zogesopinuw.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/90915984822.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/74659113633.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/migiso.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/90643982735.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/jemobid.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/37230645841.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/11250791743.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e1b045bc8492f64f3478c67a02af1c36/64570922874.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/lafitoke.pdfIn PDF document text
    • http://ipllaser.in/uploads/27412086229.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/tanofagudogubezanaw.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/86123016626.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/mapati.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161510ed624502---wurukuruzojofitunupiregit.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/fosevanavozutogaxamunej.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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 10408 bytes
SHA-256: a3303d9312ea27d41b9d891b15504c26f428eb9048ccf198ca6d09144cccb5be
font_01_sfnt_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 15856 bytes
SHA-256: 08609515175238cd699e55d81ff4d13e21bb124339e4e3019e0194d8629fc041

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