Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b86686677e2d56…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 18:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e6c477ab0fbd0f88112e61ed790a66d SHA-1: 30a876c78566423b0c89f10bb4023c40196fca78 SHA-256: 43b86686677e2d56324a11580551b3d7334570e0eb1edffc57bd5c2ba3cc5b06
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jinistudy.com/_UploadFile/Images/file/21011640786.pdf In PDF document text
    • http://consade.com/userfiles/file/64615450104.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/zixevovomavuzedejexiv.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/10495730056.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/sfr0dd043ncljfd7ugpgf8rcn6/54045232756.pdfIn PDF document text
    • https://ntc-container.com/upload/files/gakodufasopobejeji.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/bnbadgdj4tge99gsk84mgbgiho/3178210782.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f40253c73ba891419ccb07c1bb34f6c5/bubuseperexavak.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609843894862b---dawiluzitewasapipa.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/6443a880136d5210811a05a4e20d8e52/mevitedavirixijo.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/32986847516.pdfIn PDF document text
    • http://wernitznigg.at/files/27742607443.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210726022126_h6w3eo.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/zozawuduxarorubi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e76b59828---rumoburekinuwegejav.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vl4semahhqlea9coatm3ea0kpf/26075318959.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/41637343820.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c920768fe1c---jivebujokikekax.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fe34ef75c---9070105793.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/3282132183.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/30891031080.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/44014319207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=manual+portal+de+convenios+siconvPDF 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_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 10664 bytes
SHA-256: 8aacc0bb8cffbe9b7f3f0b9d22c1431b391d1d0fca1a0419b67a6c47272b0ed5
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 20308 bytes
SHA-256: f91bb77d9c554a7b532ffc1a77a0b59745f4497a53615e4508aae0967eb4f963
font_02_sfnt_off0001380f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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