Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6ddcc720e29076…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 18:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea9355145896386bfa10a51a1c54b4ea SHA-1: 3588c551a0e0078043d8d783bc0a93472467691e SHA-256: 8b6ddcc720e290768fe760e6141da25d222283535831a47c8bea66a229725cfe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ekinyalitim.com/depo/sayfaresim/file/18604702606.pdf
    • http://villkasz.hu/editor_up/41976744941.pdf
    • https://groupunsur4.com/contents/files/vubowuzi.pdf
    • http://mistral-paints.cz/userfiles/files/31870628581.pdf
    • http://casaledellasignora.it/userfiles/files/75956982748.pdf
    • http://uk-finansist.ru/userfiles/file/22302224326.pdf
    • http://aftckwt.com/uploads/file/wivanunevunedeme.pdf
    • http://capitaloffice.pl/fotki/file/82666652852.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338047dc56c---2187341240.pdf
    • http://johnmarzillier.com/ckfinder/userfiles/files/nadenovurojeviguloxeribu.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394c55d7914---wepolipiso.pdf
    • http://bfttacg.marketsearching.com/upload/files/kupolotewa.pdf
    • https://zaragozadenoche.es/upload/files/14575541539.pdf
    • http://trips-in.com/ckupload/files/wuretezinazopus.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ecb26a73---xoriganiwununifovafidega.pdf
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/tibumomiso.pdf
    • https://tlkingatlan.hu/kepek/other/file/lonazirurijugoraxup.pdf
    • http://azco.friend-match.com/upload/files/43278639907.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ase+market+apk
    • 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_off0000d8ab.bin
e4a4b999c1a871c48815b2b276a86bc79a107684ac0dbf57a9dcb8bc03cfe30d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 17616 bytes
font_01_sfnt_off000105f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 16792 bytes
font_02_sfnt_off00011e10.bin
d472d89938f842526a1d773336c2638579f7af386c21a2576ca8f5558b904a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 10124 bytes

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