Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3c83ff60f44c61…

MALICIOUS

PDF

82.2 KB Created: 2021-07-13 21:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b644f60552ee37b07fc0e597bef6ccdb SHA-1: bcfe80bd80b3da9947864a5469dd327567bf7c3e SHA-256: aa3c83ff60f44c611543c16309f02b77983cbae77c857e6ad714cda1689ed2d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites used for hosting files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of external URI heuristics and link farm patterns suggests the document's primary purpose is to redirect users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=scrape+content+from+website+php
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/pi3l9lss6rjsrmob85dp07fv9q/34322526640.pdf
    • http://altinay-law.com/images/file/96573247426.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa931d6f0e---14158177767.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef805f1a39---jakibavuxitobeviwovomed.pdf
    • http://mlight.cz/archiv/file/pivikifewenaxavora.pdf
    • http://vantaibactrungnam.vn/upload/files/makugirov.pdf
    • http://agapetown.net/ckfinder/userfiles/files/teverutufuvanugivenibilep.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f926cf7b---wowiwoxadufexozulomexa.pdf
    • http://sclifeguards.com/clients/16854/File/59313713252.pdf
    • http://climtech.com/files/files/1013894952.pdf
    • https://teyadegitimvideo.com/calisma2/files/uploads/93121735510.pdf
    • http://alisawedding.com/upload/users/files/merinurozosulo.pdf
    • http://auksozvynas.lt/userfiles/file/75039559606.pdf
    • https://alajuusa.ee/media/contents/file/wobigejapimiw.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/99425510479.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7915ea7ca---6657327653.pdf
    • https://alkirbilaw.com/userfiles/files/xuwawakegalavotigemoluwe.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0397e9a6459dea460940f22dab553c2b/6521029776.pdf
    • http://slanfusa.org/clients/47225/File/givapumosup.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/33634334196.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5da067dd53---90185458640.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/zebazefepowasoleditab.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/dumojija.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/72618256cf18173f1d04e445bf4597b8/61321316465.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dacf.bin
2301ef0dd4665a6b58ebf4f8855a2b1cd576a2dcf0d9ae3f911ec4e86c57c6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 18004 bytes
font_01_sfnt_off00010a3e.bin
083f818e22a52e0f770749b03e5dd13fc434872414a52492f2efea1c14c5de12
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 11000 bytes
font_02_sfnt_off00012375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 16792 bytes