Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf19b86ead793d4a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 03:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d3a5b5c08a1a2b40edf60d104737ea9 SHA-1: cd185f9aad4d1970af29de6978a1014916f93a8d SHA-256: bf19b86ead793d4a9f6d444261ddecdc0e457fe8ea91900badc948d77f008d05
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be redirecting users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=how+to+cheat+walking+pokemon+go PDF link annotation
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kigutusumabepomevorunu.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/jenebave.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/52715918652.pdfPDF link annotation
    • https://zlatartopalovic.rs/files/sajajizivovufitenaxe.pdfIn PDF document text
    • https://norservis.com/files/files/47622705982.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ce92f753---53019676509.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/bamumewijogaduk.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/95833366588.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e68e5a9be---58632938795.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/segupu.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163175100073.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8e466cf6---77305725982.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/99599107872.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/14808485804.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907071415304819.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/fumamexegoxazolo.pdfIn PDF document text
    • http://hueide.com/upload/files/36007602000.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/73399391266.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161339ea45fcca---10134950968.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/88587085638.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/21546947968.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/57197873951.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/37401539502.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614145905dcc2---ladiruwajezako.pdfIn PDF document text
    • 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_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 18080 bytes
SHA-256: 61704cf09133cb3f91b4e40b411ee1affb4303d34fd92620eddd08eac6ce762a
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 10720 bytes
SHA-256: f81be12554d574407520caaa5eec76f7847f98d32c604b21c67979a8bc92c3b5
font_02_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1