Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc6f6fd8cb0a279…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 18:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6906ff579d813644121d4009a64867c1 SHA-1: 54c5baf508bedb4ba0ba97a1cabfed007415dfec SHA-256: 3fc6f6fd8cb0a27957cdf5a817f25a9271f912d99b24fc32f46d7ff39bfd12e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous PDF files hosted on various domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm indicators points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609afdc2854cd---76596197341.pdf
    • http://krzeptowski.pl/file/68767844850.pdf
    • https://freebcard.com/ckfinder/userfiles/files/66113690738.pdf
    • http://www.pacautomarketing.com/file/ruzojididu.pdf
    • https://fleschimmo.lu/userfiles/files/duvigamolamojomudebafof.pdf
    • http://fabriziocar.it/userfiles/files/24694860287.pdf
    • https://oklogistic.lv/upload/file/78697329720.pdf
    • https://baxsporthorses.nl/userfiles/file/buzazalemavuvinajulex.pdf
    • http://nordicaluminium.ru/userfiles/file/papisobesobugilanumu.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/66008929585.pdf
    • http://tongkhomica.com/upload/files/60982092545.pdf
    • http://maroba-zirndorf.de/file/zibed.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/165e92cff6e302bc9eca2c548aef3061/latigisimigozigu.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9695378c66deead95c7342091049ea18/nifoniralavazazifakodem.pdf
    • http://pro-group.ru/userfiles/file/xamiduwoxezovexapedufe.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab33ac5d3---64775584899.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0332716d7---desawi.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/th8apsgn84gs8n6qd4m7n6l9g4/kavebu.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9lpfmedjbgqdt0cka7p26jl8s6/tizilikuvofetawo.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/84339222823.pdf
    • http://xecuoihuyhoang.com/uploads/userfiles/file/sojorativazol.pdf
    • http://csc-020.com/userfiles/file/20210612182512_41dwdg.pdf
    • http://thietbiotoviet.com/Images_upload/files/12825914611.pdf
    • http://daimarconstrucciones.com/images/admin/file/89019455230.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sinus+infection+double+vision
    • 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_off0000db5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 16792 bytes
font_01_sfnt_off0000f371.bin
863ca50d669d6806ed84fe9d0175ff750d4ea6d4f429e273b4d3d0e222796acc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 10588 bytes
font_02_sfnt_off00010bb3.bin
1ae48ca44c5616f3520a393ae96463e8c309c7e3c8547e772c56231e27b39807
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 16024 bytes