Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f12db58242f80b8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 20:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4efa5a468a59716d24f3e27586db753d SHA-1: d156bc3b725de0fa4db39276589cf84a0e842e60 SHA-256: 0f12db58242f80b88d530248ca254905f0dcd632f4e7bac58e3916a51c07462a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a password-protected archive lure. It contains numerous links to PDFs hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm patterns further supports this attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=muy+lento+mi+android PDF link annotation
    • http://farmaciacogliate.it/userfiles/files/vokejuwewiw.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/ranividefuwateza.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/japosokoxijinubawimutu.pdfIn PDF document text
    • https://dhesient.com/media/51587169785.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef0d0c6463---51355087541.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/xevimefidapu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916a837880---dezubulurebubu.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/zobigemulerevav.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/60554296553.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613c749f4de30---63202382145.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/romirudakotutinezito.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d511016ccd40ae33212e7b29c15791f6/45217556898.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/xepikipivixadupogogadare.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/73636642875.pdfIn PDF document text
    • http://autodilygood.cz/files/file/98381905582.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/34571570308.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/85513294795.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/64788531182.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/36832522261.pdfIn PDF document text
    • http://js-space.de/userfiles/file/71738521862.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/kukebawakomafigofofeka.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b4c98f977dfcae2c8eace3a251ce13b0/57499878100.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210907015857.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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 19004 bytes
SHA-256: 6698266c5ed8722cc6733d6ef0ec69dd0b304c111d5cd192d5b2b03d5f0b56c1
font_02_sfnt_off00012a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A10 10448 bytes
SHA-256: b2819268def35bd7ae89c7460996eeb7c7d56e21d2aeeeef14cfd7a4ca37a249

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