Malicious PDF — malware analysis report

Static analysis result for SHA-256 43897ac14647d2f5…

MALICIOUS

PDF

96.7 KB Created: 2021-07-10 02:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a2e57ef8ff53b06af6faa1f2aa39ea4 SHA-1: faee24eb243d964ef8589b7ea379aaf6f781f6a5 SHA-256: 43897ac14647d2f5cc54901e0d73f3cc0bd8a6cb9baff8608d4780eba535319f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards the document being used as a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=uses+of+excipients PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/10caea4b75defef062f0fed90169610f/zererubefemewob.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/robotinav.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a2bcfa965d4464efe923f4d2caba04ae/87016882924.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/60559972562.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607069ed0e0a2---luxuwijud.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/zesuriwadawef.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/59debb61415db5958c46ec7373c1fb0a/netuku.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f3aeaee3---xifigog.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/kibojisubepeko.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/23779053008.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c72d33fc5---92732562953.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c8fc062c---34512674402.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ba89d07d7---rubifopovefaro.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/evfaeevu1bq8sk9cipkove61pq/vusukasabuz.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a835648ccec---wojalefetetasipik.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/72893879170.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c26382c7---38918499135.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/barozuket.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077019416363---77537989499.pdfIn PDF document text
    • https://agatanorek.com/files/file/poxubapofodabidibebesamas.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qkbjbolbsj2g55dp5p17cg23ql/24313504086.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723dbe4006b---20249992521.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/76102093181.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_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 18540 bytes
SHA-256: af8d87e6bdbf36de609eb8b761b6e895d61237bcbab8acf96d4e87db8fc7e752
font_01_sfnt_off000146c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDB 10272 bytes
SHA-256: add8a4a85796b494c7e0134d58ee5f693e72693b3932834dd49d1772ebd26f54

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