Malicious PDF — malware analysis report

Static analysis result for SHA-256 260dc6f21278376e…

MALICIOUS

PDF

89.0 KB Created: 2021-08-06 15:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 256edb43dbd06cbb55be1aaebea59989 SHA-1: d93217bdd3b5cc385f3555b41dcf5a4a54d4480d SHA-256: 260dc6f21278376e3f4afbbf3d0bc25d670f5e6b5bb4fbf693457306f2921287
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garglob.ru/uplcv?utm_term=what+is+higher+order+thinking+skills+questions PDF link annotation
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/77e4494f78dab917691db14236e5e988/94599171698.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bce67fc45---gujedoz.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/fabdb35d99fb5b4fbb016874eb2822d4/tosujabebufivi.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/72737337804.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e4602d1b4a43770f0ab8a68f1d94834a/3594279931.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/bujukunovipibutige.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/namal.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2v1b9pf8bt98qfv97vjn73dgb5/zozemudoj.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/ketemegiko.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/93644f9a4ba2bb4e15f4d8b7d2945d18/14970196126.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091c43259502---lurajimuliwunofapate.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/diloperadide.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a141a04ae42---63812478557.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-6/20210706074437977986.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/jumirikoxono.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/75736b55cc60396dde1b03bb70b20909/72639079839.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ac5a362f7daa6345afae7124a5b68fe5/tijesepaladibarozanodopo.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050321325611.pdfIn PDF document text
    • http://matras-devison.com/upload/file/tejaxogipagadilutipi.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3rm1p926qv62dtachsgj0bdqek/11283300656.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/tudomadorajarefi.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/mimitefenawafiw.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f241fd651797513fddf2b4f850129e67/23346490726.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621356353.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_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 16988 bytes
SHA-256: eecf9bd73f9ff19a8d51227da6c0d63d668ed26e6dccd4e35ee77345a63e769a
font_01_sfnt_off0001246c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 10860 bytes
SHA-256: 543027c70de9405cd457da2cfaf7c56590e3a3d12a4ec89a4ed620623d3a9ea9
font_02_sfnt_off00013cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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