Malicious PDF — malware analysis report

Static analysis result for SHA-256 c004342eab685ef3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 05:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2418bec93ab8080041f4c33ae5e72ddc SHA-1: 4acf1ba19a231a118f6b8feed8bcbeac69bcf7ff SHA-256: c004342eab685ef36f009b5fb861dba94ed242bfe0adc8427ad0a2dfb541462c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=watch+the+walking+dead+webisodes+online+free PDF link annotation
    • http://immodraft.de/images/architekten_agentur_images_/file/23872554366.pdfIn PDF document text
    • https://kimcert.org/E/file/74452215234.pdfIn PDF document text
    • https://basisnomor.com/contents/files/poluvurad.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/nedubovariwanavoxiwowa.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/gopodojuki.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/6986726957.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/kusufe.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f24841a37---38532368317.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/pudibajirigiv.pdfIn PDF document text
    • https://electroagro.es/pub/files/99690380399.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/mibanozegiwusinuj.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/67200737424.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/21421213113.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/lapifimodogozuxadozurexo.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/moxemifesutidezepajivole.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a8ie1f3neb23r4fum5mol6nfs0/55041175395.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/68614868558.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/10883714323.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/6038958068.pdfIn PDF document text
    • http://normel.org/files/upload/file/vukulitukexebapuze.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mazilumubigofufu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d8ca4948e65038ac8044ddc32c3e834/temejalakutesirusafa.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/68259684983.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/kesakajenebalobomorevolok.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/62624897189.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_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 17608 bytes
SHA-256: 8c64b171c8a2f1d282c8816b688ffba7761dbba06a85992e7d8e4fd8976eaccc
font_02_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 11068 bytes
SHA-256: 969cb1f3591e9ad8692bba1b67bbf18a81f5b4d6c0fbe076885609384d117a4a