Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd6a92c2f364970…

MALICIOUS

PDF

80.7 KB Created: 2021-07-13 13:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9837d838d33662f904567bd3c7359065 SHA-1: 11595c3342832d46c2325f54b028f42b23d4926c SHA-256: fbd6a92c2f364970b6167de76788b04b83b18f9b721add3b0d4cda027db0bb4b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1th7rr0cjag0b08uf0ev3tdutn/18381068758.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f250458c3edd856dc5aee69652613911/zulopiwonomusar.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/7vvkd78gfrcv40qolicb1utlls/kenim.pdf
    • http://ndc-group.ru/uploads/files/8967992167.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a4adc31d23d795705e4f66537390b34e/duwigola.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a91db1cbf40---pujelisefebutaxojunirovo.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/6b0ce6a3e0384ac67ee883165c3fe07a/68724765638.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/38bd8ffd0d1e3886c62b58ad14b5d00f/balefozik.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1921a674---wopumebemavi.pdf
    • https://sayurhijau.com/contents//files/wujogen.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fb2ad3862---78954480369.pdf
    • http://aucoindeshalles.fr/menu/file/49697849546.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b843b832c6c---putigudajena.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/81078fc9dbb1ce2ba060882cc8f51062/forakesugonari.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8f4de0e2f74754a306d4010bd1b5b6e9/15157106881.pdf
    • http://tlxzkj.com/uploads/file/310158528964.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73d552d7b---liveloso.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f3b8c116f5ceba65482def7117b5f3ee/silowopikotivofux.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/83963bd62dbe1a5f55642d60ff0a78ff/vasivuvodiled.pdf
    • http://amsasecretariat.fr/userfiles/file/78910961304.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=black+panther+full+movie+stream
    • 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_off0000d706.bin
da20a27154cf8fc5f70e8fa3eabd307a24a0a34df90bafdea377379dcb815dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 16808 bytes
font_01_sfnt_off00010258.bin
d22f424e5134df4e334ac6e3b67f90a16251d8ed13c5f7321d351bd3be70e75b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 11056 bytes
font_02_sfnt_off00011bff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 16792 bytes