Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba8b04efb820b9e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-04 18:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e002c99d147f1f6075f31eda91d013b1 SHA-1: 7f6a7a1043b5ea46d3b3ca214286b70ec594c314 SHA-256: cba8b04efb820b9ec1131fde66e4099a96548283fc5903b35cf48345ff539895
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=conditional+mood+worksheet PDF link annotation
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d96831cb3e537c8d9b2f14cc46717b82/63155376551.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/wiwamup.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/dujilaberomedidigejozote.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/36945361354.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/67da98277247d89007bec651241ed4de/tukufowasuxaru.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zudelibonewitiganunamer.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/tulivemazadipobukeripigi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9eb76afb2---60258026522.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tixozi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160730016ac575---fuzuzaje.pdfIn PDF document text
    • http://rideco.hu/upload/file/25376983202.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/luveko.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70add77e0---fedoxoserevegavuwazaj.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943ce62eb98---fikumexukoxuroxi.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/74420263516.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17952a01d---sugega.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/5987035135.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/mofamivoxak.pdfIn PDF document text
    • http://erdbau-rauch.at/24334063461.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/7749076aef0f3fba671c11940cd75c3e/tebitanetevuwobena.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83B 16228 bytes
SHA-256: 05fcc8ff09759398c42097e6ef3e5946720f35281ff414880e4659601789c4d2
font_01_sfnt_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10720 bytes
SHA-256: 239f6bc9f1581aaae46b3176ea00a97043355c0e17303c0789414a2dd0d1a945

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