Malicious PDF — malware analysis report

Static analysis result for SHA-256 87692c47cc7c50a3…

MALICIOUS

PDF

72.8 KB Created: 2021-08-27 22:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e25e170dda9b4350803376717ac87813 SHA-1: 0df75c411c0d89a3197b7ed5e2aea800b155b415 SHA-256: 87692c47cc7c50a32c567e1aec7290970ffe892c6396a35e31868e19d509b25b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users via social engineering, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://archism.ru/uplcv?utm_term=not+to+toot+my+own+horn+but+beep+beep PDF link annotation
    • https://4appsoftware.it/file/nurovapawiwamitulipagesi.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/20856725273.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/mujeg.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/difolal.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/74usu8baqsstb9rlvip1qnkkks/35593817691.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/181541d83e131715fa824f87722abb36/94027872769.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/b60hupclpm7echrr9unmi6lv1u/wowonadimugufoxuru.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9f57ba6b4733da95a662d11134d7b92a/1322258839.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb86684e5e---62229252393.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/87a681c442c8df68e465ce6e7b207623/2938126597.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/tawikabobus.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/63773114755.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/33815826bbcc8c07ec7aef57cfe13f8f/99830487935.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9pl59fbnrgrv88i8ujvoe5b4v/rotaxaruzaxotajobawiw.pdfIn PDF document text
    • http://expresskaliski.info/file/bamegokozukiboxe.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ou8kpsfsovemghsjrfdmic2f05/33993300866.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/zelorezafod.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/lesejajaxuvopitinisot.pdfIn PDF document text
    • http://slsnn.ru/content/file/silunanevukerajodawib.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/47433376773.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ceb62487c92f33bb36054919ef951d63/lupalokifitiwowoxevuwemo.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/3849f6318e438877ac0f13ea7eeaaaae/29024999610.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/lobisijewasaxa.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a6d912cb75f9f54fe4228229f52c2d9/simoxidigipileworojo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6dc159b---38245350582.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0816c2b44---34845461311.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_off0000bd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 15928 bytes
SHA-256: 3f357d5421befb0f68ca7d8ee12b762a2682954c8cf9dc8e4523c19cd7a465c4
font_02_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 10464 bytes
SHA-256: ceb3d1e9ebeb1c3749d8915f193cea3ca0c1e5d0cc62b9b90c7fce55bf503642