Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca080742bb4017ad…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 23:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17afe41e61cf951554b5868210c88bdc SHA-1: 0393babd895dcc349fb70830acf595021f5a00c7 SHA-256: ca080742bb4017ad648f6437f448d74e842c3009b886fc5fd19cc15c9d043a01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and embedded URLs are indicative of a phishing campaign, likely attempting to trick users into visiting malicious sites for credential harvesting or further payload delivery.

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://crysiq.ru/uplcv?utm_term=teacher+cover+letter+pdf PDF link annotation
    • http://ecohost.ru/pics/images/file/5459085266.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161263b7752351---rutulupi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/s85qj2nc5f701m95jgm2k8aka8/jaloruvi.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/laserozopipomolagiz.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/mefirupuremujuxumubiluni.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210810_C3A67FA14787BD4E.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b4d5c06e3---wozuzu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607212483a510---86305814893.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/tasularejolinosexotobi.pdfIn PDF document text
    • https://alutat.com/data/file/tawasegosarobesoputuninu.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/kirafujejalu.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/renava.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/fb4babbb9b0a23b5c87060f1d32cef5d/tanunobegarerewaxemoxarol.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7c9fdba92---43067213144.pdfIn PDF document text
    • http://minipit.com/data/files/talugunigevekovoma.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5080df5df---83019688660.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/gobekekoruvemurusogij.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v495qvfniq69furfs01q3pn3d1/wapoxusefalevijil.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/ropoponaxosijizunugi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160add75676c28---dipenugezotagizagaxunam.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/61923678723.pdfIn PDF document text
    • http://nakatka.com/files/file/naxoralisi.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/daxiwesapexow.pdfIn PDF document text
    • http://rilta.net/userfiles/files/tudid.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_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 10380 bytes
SHA-256: a6445dadad24c7a5122e330c73edc026af577dc5b0a401b1fbc7e021d528f6db
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 17912 bytes
SHA-256: 5ebd5712687fe5c60c5f23e5eddd013f9f60fedbe5f937993b7205b08143badc
font_02_sfnt_off00012cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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