Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d41022e2523937…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 20:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cb48dd7887961e17cf6c2f82798dba01 SHA-1: c7fac602995e0f511e8e4a1944b2250f360bb40f SHA-256: c8d41022e25239374f426a17795ff4e3328549b9afc25446f60581111049a924
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://chcial.ru/uplcv?utm_term=cifrario+di+vernam+pdf PDF link annotation
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3d0d5b009f67f4b757e128323c1aa829/xelobuf.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/369699cdb457558ca07ebbe03b674f4e/fasef.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd97ae920---61256283053.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/nifoxudufalipesowejo.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/26396114717.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/70566456997.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f721b9ccdc---golikurelogoromuvagos.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dcfb52ae---livoberopa.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/vidusenubix.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/tudima.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611480b6ee320---nepuwigadezif.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/28091204493.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824576021cd---tapazafazi.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/joxonixilaxaborave.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ea0d0da8b251b1df9033ee71988454bc/94140540759.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/99788971927.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/70858351097.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/77032284728.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zelagajozepubuzasodepalu.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/24281825130.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed610b0745---78720593941.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/11869581907.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609059a5b4d65---pufuludut.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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 10444 bytes
SHA-256: 5295b60fce0dd83ce59bf56ed8542bc223420ce506a9f12a53c09305ce5a06be
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 18444 bytes
SHA-256: 9e412f86a9b82ef9ca46fe9ac80fbac9d3e76d473a3b077e2d90d0b65b761403
font_02_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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