Malicious PDF — malware analysis report

Static analysis result for SHA-256 db285ad79ffd2480…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 14:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22efe2ea94c7d340167470b9242e5d7c SHA-1: 9de47942a2d5b595e06473aa3383e4d62c05330a SHA-256: db285ad79ffd248061c2cab8f67c7a7f00e9bb90a525875496e8c20fd27f5907
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://truckforceone.eu/upload/editor/file/96435290354.pdf In PDF document text
    • http://xszhuhai.com/uploadfiles/files/netotuvepinumetowupe.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/76044222845.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1632243284.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/saketirazesofemu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614653204b792---18930286704.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/86707454035.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/16887001446.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/da3ccecd60c8e1b826085432bddcfd90/sofoxiwufaso.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/48114216864.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/filarovefowexawola.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/54059647665.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/1385542979.pdfIn PDF document text
    • http://whatdwellswithin.com/file/19792739694.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/19566496190.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/56602717125.pdfIn PDF document text
    • https://activepymes.com/pub/file/xetaketane.pdfIn PDF document text
    • http://willbramephotography.com/55299398763.pdfIn PDF document text
    • http://le383.com/uploads/files/89425458726.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ae172c28---61050052991.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/mireluxapuboki.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/65752659190.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/62831573874.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/barekogifutajegijadefuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=france+vs+portugal+2020+livePDF 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_off0000b2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B1 10932 bytes
SHA-256: f0735bf9113a5716e5a629145f8fc93c9ea0f0e01b5ac72632bdb9afd9ed52d7
font_01_sfnt_off0000cc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 14972 bytes
SHA-256: 7d1865276a93803669a11e247d3d1783e50b417f75021f01c611bbe07087b839
font_02_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1