Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba22b67e9ff047b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 05:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 179c11641b06a8b3f1918be79ffb41ab SHA-1: 9fde4cc72dadbba6f601f54f057749d85131b5aa SHA-256: cba22b67e9ff047b2b02469976a52e6789bfa4c597ae2710818c41b5415c384e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further indicating a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ebd623ad---5034144587.pdf In PDF document text
    • http://orem.mn/uploads/files/72055813469.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/7dc9c9749da46b715b2e353c93deb360/32751104270.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/47994615272.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6616c052ebfc20708a0f1f4d948a27a4/19525020196.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cbdf4adbab6bdfea4a95203ea731067e/fowarowuzebivazifidewan.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/36532198181.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/61716726176.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/fowepibopekunizowirex.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/45354030042.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7aa64b190---67756576776.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf8da1cf8---44222869152.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/23374889818.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/livekanijaviwulurizo.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/34325898768.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/54asbtfamplq8luvnut59cq76c/petigage.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/punanof.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/sorimogazatoxekolux.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/nanaju.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0c9b58c4---48118905923.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/vipefezenobek.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/39700109378.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e13472c48c---fogazopenafuzalinezi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c52e939f---banafuzenaluxivemiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=street+fighter+online+game+freePDF 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_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 10568 bytes
SHA-256: 8a6c4817011560411ddf134adf07e1c2185f7ab0239478538a1aecf59b1e860f
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 18324 bytes
SHA-256: ca0fc173ee802c6a90fb63a23692a32ab6c8858539538669794ee6c1dfb0cf53
font_02_sfnt_off0001273d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.