Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2ebc7a885decc9…

MALICIOUS

PDF

89.0 KB Created: 2021-07-20 11:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff0c40798bf0fadf2ed24a804773eebb SHA-1: 20f657e843145344a830cce2265d070eb92fe683 SHA-256: 9c2ebc7a885decc94e5dde1c39d8cf5d51ff7618aa062c7f812419a581284819
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://slide-bearing.com/d/files/nelisonopibudozokodataxu.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8400eb7f---xemusekabuwidowekox.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b95fcbc76---70119182185.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/uv1vr6bic5ftich8nphljotg93/48614345458.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbc724b135---48412941138.pdf
    • https://autopsrus.com/ckfinder/userfiles/files/nikuvikivebabevumu.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/buxesikefewufumazorigewik.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160f05c4365096---55974810835.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1b0e100c4---55966154333.pdf
    • https://angkortaxiservice.com/userfiles/file/nekobunabelulegeruze.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c25edb4b---62172874810.pdf
    • http://splogservice.ru/content/file/71361759825.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f252f7a806---vadigesifap.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2dke4ajc1volbfa6mahlkompg6/23563763327.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160879892ee636---80492202492.pdf
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/senepaxibogumeladitofuv.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607447c011d3f---63884527138.pdf
    • http://atdawnwelift.com/userfiles/file/44957416824.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089ace48155e---72431929088.pdf
    • http://inarchengineering.it/userfiles/files/48572317741.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3c76da8602a9d9e8dfc8078a98635c5b/xuzododirivunedidiwi.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16093a25f2690f---57076792.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d580bd4650---48161350877.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+anime+sites+to+watch+for+free
    • 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_off0000f7ff.bin
aec11b19d84f5070639e6842d44495cd1211a287d1f84dc796cdbcc684cc6242
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 17472 bytes
font_01_sfnt_off00012608.bin
60d791b307c68a92ba0d0d0188adf9f5012e3e36206dc94d5498a37d0c1ca0b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 10696 bytes
font_02_sfnt_off00013e7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7F 16792 bytes