Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cfa88ce2dedb3c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 05:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90b6b6950f7711697d6a37a2c384f40a SHA-1: 35a38e05a32d0378cab55ed28ac2d14c3db46b33 SHA-256: 83cfa88ce2dedb3cd7fd922f3d3f659612809ec06ee10f1d81793e221f944b7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating an attempt to obscure the final destination or leverage SEO poisoning. No scripts were extracted, but the structure suggests a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16077c83b0d683---bulujopivelu.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b536f8f6---favabezikozuzepud.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8751b9039f---gitajigopabim.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb37e28214---15149672093.pdfIn PDF document text
    • https://lecachet.fr/docs/files/zukadirajotof.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1240b4305092e84e15b029854119021c/mojawuzok.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/warubufejoditifukomewuzen.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/261401349433.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/34219902366.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e3692acbcf13e586ae834a1928134ac7/21725541873.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/samalasomepibozu.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/11857089408.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba354b834---31478428715.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094039a5bb9b---64444021827.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/36335058607.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/fevopev.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/rozijiwipupaj.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/47086843952.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/6559434059.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2305688457e003cd8e6368493897f134/matubebowedanasen.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/67185413369.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7de1772bf---dokazotawijiridumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=subject+pronouns+worksheet+for+esl+studentsPDF link annotation
    • 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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 11088 bytes
SHA-256: 17ebe642d94dbd1d6c6a7eb02eda7a879719ac6a7438c6bcc65eafe41f966ab5
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 17216 bytes
SHA-256: dabf38a7bd7cbad91a5a2f46d3e92400c03dfe045408fc2fd3d0d4e8341dad80
font_02_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.