Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0bfa2276f69916…

MALICIOUS

PDF

81.7 KB Created: 2021-07-29 22:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5aaef4c73ef0c5423ea1ca4c89749736 SHA-1: 980a86610acde2be7878a7eafa8dbfda9466cf0c SHA-256: 0f0bfa2276f699169d66044016db32c338b6c24692792fe65c170e71041878dd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://allytemp.ru/uplcv?utm_term=the+silenced+2015+korean+movie+full+eng+sub PDF link annotation
    • https://nnkcreations.com/userfiles/file/38088895635.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/mabigovod.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/roferep.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/95581012814.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/soned.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/22962213083.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7ee9c5c6---xamegepepedo.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/325c96fdb53851674af85a49321e95ea/xovebaxukidobiliwi.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/wusekakoxevabisugovune.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075261f314d7---30887403452.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68b6c8407---pazetopazurozimijepudig.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zoxoveb.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/k0242nqds1nbn870h7bcpvjusd/25034410301.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc790ae2d0e---87190080812.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/26698495912.pdfIn PDF document text
    • http://labonscafe.com/userfiles/powuwavugo.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/83780030059.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/27816954873.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783af6d2ca---faxalasawaraz.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/xifutegofiseximajavujone.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d65858df63e4347b3f712f4e8b8bbd97/84776988391.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c69ad00cc4200b432aa1604723c3b0e0/vidujuzosojojazuxejo.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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 17708 bytes
SHA-256: ae1b955982863a7483f4a9c4361b64270716ee9045b595a7c1e2ca2c0a3c2b3b
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 11612 bytes
SHA-256: 9d9448b047d2e8fdfd6f854f4fbf843c4ca674557b7e530bf79c266ea1915da9
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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