Malicious PDF — malware analysis report

Static analysis result for SHA-256 967cd0252dd85d99…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 12:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3bb7513c97048ca26549c708ac3e0d25 SHA-1: 78ff96815b18462468cc330f7a61a689cd6df080 SHA-256: 967cd0252dd85d99563c11628ca14a5af2125cfb16eccff2df6aa42eefa3c59f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sattosushi.com/uploads/files/53830998212.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160adc815bbe4c---gekajanitanuzin.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/wunumumikufevazuraxewudis.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/18390869335.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c0cc53da---jopesijinufez.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16080efcaafba6---tafesunafawikar.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607550c46f669---42035680263.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/16528988547.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/d3ouroah2ndp8mhbn9b27pba06/jeporo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abdbc036a26---86918319514.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0bdc7b75---pokedeximasumadis.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607810a40aca2---xijegatobapovabuguwazupor.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/27a81de28422ba0bda0aa1e6af5f8b56/bobijudajorenime.pdfIn PDF document text
    • https://latework.cz/soubory/nuwaresogajoli.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa4d553dac---jonele.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/keledovelukiluvarifo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dce1b94e---xakapuzelakapekemujuliv.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b479ae75d3---fifuromurawijefetukolatu.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/57778257486.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/pitibe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9bcf4786049c190a203a7f885bec36d4/nexexapizoxesakefurexezi.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/be619ce1940fce1a332a55a494cd4b72/39310629522.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/4f68da06d2f889313130660317a4c0d9/kelumixivuzilomebajekiv.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071533a73baf---73793797599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=halftime+show+performancePDF 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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 17444 bytes
SHA-256: 183768e04490a59b1f5a0adaa0f37283e2879adfc2a97ae43a7bc8a1e8968802
font_02_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 10824 bytes
SHA-256: bf83d6a9e3050104b752574ba68fdb29e0c197126cd2c0a7b444f3f62dc60743