Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d9dbed19f85126…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 15:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a02f1dba999b5b0b7ea7722260cd198f SHA-1: 9565d3648e871527492d6cb6496d921e6fe78c8d SHA-256: 92d9dbed19f85126fd551d1b927cbb396d886d615f66a208ceff2ff8e3975bfa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs clearly show a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=synastry+chart+meaning PDF link annotation
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9994df2df104ca01c00bf0c991ca2324/bipuba.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/30138270175.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/67e92d7885391dd68bc15ac4c12a32a9/lotiza.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f61b46d20a704da549fa10a356c295d1/49631321654.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/3917990275.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/suvomubivifeduwogebekodat.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e48c315f7d8---93491681604.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751b2ef841---bazurelanis.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/xexanidepuzukofupar.pdfIn PDF document text
    • https://agenziadiviaggiocagliari.it/file/menudodesivemobosilula.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/nedifagonem.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/34842662281.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/020g5ntcsma3kfu6klf31dqq52/voxolubilavefowizuk.pdfIn PDF document text
    • https://topupdana.com/contents//files/vagomepute.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1a887736---83921193278.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/72670950161.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e2c4834cd---17411953627.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/352b1fce6c49f17a57713d512b14f2b1/topolisujoxogezo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608445e894f3a---60597823189.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/67c835487ee5ef4dec4aaef6ac1d2385/56975513234.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/81271525202.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/172f13ac18cbac804c9387e60a0cef60/858619840.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bd64640952a456d3f7fecafdafd9f489/67244107668.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210825083124.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_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 16328 bytes
SHA-256: b5dd6a1100700d96970ff4e69488b5492afcd43ec315130f235a63ea952b1b4a
font_02_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 10700 bytes
SHA-256: 56ed69bf396567d0dff666db0f34ae58754039b17f9cd53ed0d80465311ffda6

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