Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c586881e7c1f10b…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 19:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bfd7c9da19c03e5deef5be29ae17736 SHA-1: d2ed9366ad20e3d5154fa0faf00aead1a5c9ae85 SHA-256: 9c586881e7c1f10b5849526d92f5822eff3a4c8611f1d2c420b7cba18bb5b455
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dostavkaturov.ru/files/file/49827038568.pdf In PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/65103573742.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tudawiv.pdfIn PDF document text
    • http://charontrade.hu/data/file/60261973766.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/tutajarimo.pdfIn PDF document text
    • http://retrofotr.cz/files/file/gegawesebuvisobip.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/nobidalovesobubejune.pdfIn PDF document text
    • http://apothepharma.com/upload/files/29072944490.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/katasugofa.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130acf82fb51---pesupetiv.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/ruximituxivelid.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/46945254380.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/tosanojurekibivus.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fdec93a1---dexefuninusajatoxepotim.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8fc871cf---xunotajawur.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/5225037313.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/lusegotexilonisesupuf.pdfIn PDF document text
    • https://baptistfriends.org/media/fowolexijojimem.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/daseridifidoditipenok.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6363ff520cd1d5935a37f5de13e3c5a0/ligajumenonobodoxo.pdfIn PDF document text
    • http://freeorden.com/media/file/gejunemuxididoxovore.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091123050131225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=vault+on+androidPDF 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_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 10012 bytes
SHA-256: f44eb75ca40215229e5f449c85fc13b1365ebf064d0f5f3288a147bf06e832ea
font_01_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 19572 bytes
SHA-256: d20edf0a29fe83c4373bc9b806e06033935ba3369d62e31ceb545008bb1c33c6
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1