Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce92d64029d9c9f…

MALICIOUS

PDF

88.5 KB Created: 2021-07-15 21:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6ad11477081af6c6274bf1124ed2d2b SHA-1: 60086105d8f55b36606052e00431f6130c13f8b8 SHA-256: 4ce92d64029d9c9f7aa40e5b4c763682a8a5bd5ce29d2b0365adb45b177ec3d6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits vulnerabilities or contains malicious content. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dj-maily.com/uploads/pages/files/87243309712.pdf
    • http://morecoredesign.com/images/imageUps/files/nezajodisexemevawezesob.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/72018151872.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94620bf528---26819074369.pdf
    • https://daismene.it/file/65656893377.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210528104954.pdf
    • http://klefmarken.se/upload/file/duzabefefufikexaxakuv.pdf
    • http://afghansolar.com/userfiles/file/31251656336.pdf
    • http://inezorviskids.com/clients/37546/File/torapota.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e8bb2972---nokalojopegu.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f0331f77---supofunipu.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160772fad101e4---75205177612.pdf
    • http://archerelectricsupply.com/userfiles/file/lijiviworizosini.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/nbb3llmti7b48h314s030gi93l/lemabewuxiregirowuta.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/sezalixizawodobilipuxan.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e1rt11ft0bk7seh9tbq62tbmc2/54733684057.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2cfe0764---5648619878.pdf
    • http://alpha-th.com/userfiles/file/91195394409.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609106e4431a9---xerimiwifisarewoliberen.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074380adbac4---rikoruko.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e05bedb60de---60332157099.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/57005210090.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=amish+dating+bed+courtship
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51c.bin
90cebcec04cfbd6d7be2f64c67a7442fadba255092f6cadf2e01e66d65cf3516
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 11136 bytes
font_01_sfnt_off00010e80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 16792 bytes
font_02_sfnt_off00012692.bin
b44f22121e6daf49deffa4c2cce1e758741a3260dada862c0e9ec3cec80a8f28
pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 17668 bytes