Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b010b7a860d9f93…

MALICIOUS

PDF

88.8 KB Created: 2021-09-13 22:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 586049cba2e68b4d77d9eb08d3b1e2c9 SHA-1: ac2307d564d92d6e775e775434dfabefb3ae53a2 SHA-256: 6b010b7a860d9f93d339cea871f12dc0dda16e663c413d865429d33ab218d3a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://bkht.vn/userfiles/file/64074534597.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d738990ef---nalazinese.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/guvodamuj.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/kemapasasenavanunovep.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e7c6f2560---35313345435.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cb726fee---60488164388.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/92876048310.pdfIn PDF document text
    • https://haidangpc.com/contents/files/kezorut.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161399b2d2289a---64897807230.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/25864200864.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/35756658905.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m43s3bfrm8pm4b9h88cd3979d4/33421405998.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/33202154927.pdfIn PDF document text
    • http://trieuduong.com/images/Download/pebumofevujubojizisufiwo.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/37762520717.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/jugixevawunuxedunazilip.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/72462319105.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109080505563938.pdfIn PDF document text
    • http://pedraferro.com/files/files/vekigovux.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead0b0e19f---zafamew.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/49939629259.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/binufedegi.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/90330605476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vn+video+editor+maker+vlog+nowPDF link annotation
    • 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_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 10636 bytes
SHA-256: 0420050ec815b60e80574b0130fc27c4acf6cdb5cb4191694d8228a1d35d9096
font_01_sfnt_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 18264 bytes
SHA-256: b95622003b1a8269b5ec17b61ae9b2ad10f0e2edb2599958f927a07eba08b4b6

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