Malicious PDF — malware analysis report

Static analysis result for SHA-256 4002b54ace402b7d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 14:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86d25f6e88321bdb83b550ca3983a11b SHA-1: 601fba494d174fe871632cec69218913e7592dae SHA-256: 4002b54ace402b7d3bc9a21871e74b196d0bacec9b11f023a8d8a3f23e6ed2ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting, likely serving as a redirection mechanism to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=make+your+own+writing+worksheets+free PDF link annotation
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/joresiba.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7241cb1ef8---38666353256.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/18423631623.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c7a98f1e---86583707167.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/17092543794.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/ae9fd0eac4026263887ecb4afcb28ba9/tubajinoginog.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/dijuperiwikabe.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/37860708193.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/71160542903.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/wulonapixaxulokisuwajana.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/gl0gc056ol18281kiqevouqes5/dasamafadowebukeronog.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ad4efc63---96350721945.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/14344546216.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c435e039---kamujasoja.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/986aaae5e1bf65c4623724a77783f934/16497662097.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/gadimipawokawagekomenepat.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021080603043173499.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/4135434579.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/12ba6ddec73adc9b1b85c48b3b2c3228/75581991408.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/97814315770.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5ad5f7bb1e2d9c7bcaa6580eeda0e3d0/21762146070.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/caf79bab019a5bbee3bb12211166ff79/xifuzupurirejuxewir.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b89bd205314971ac8290a8ec80de069d/jobarekezixi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e4e38319---gozonubipajixipesamobuvi.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///81226862719.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6b570b7a211ee9e5a74504223fbfd28f/bebolurevijemeduz.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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 17432 bytes
SHA-256: d6f0cb0e67950d33440befd099a9ca926431a5da0f25bd44a7acf76277646c51
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 10832 bytes
SHA-256: 865ec8548f9d19acce748ee939dedc566a35a2dff06e3ab0ba2e64d06c8fc8e5

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