Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8967431c04ba97…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 16:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0b6f01b8145d5edc5004d55248d3b16 SHA-1: 0db501759a75a1553c3d5821724af3387f6d267a SHA-256: ca8967431c04ba975934b00ff2307a0f22a238a41bd899b0da121915c39363a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites, likely to distribute phishing content or further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9e4cv0sl5meohbfvhhjfk67sm2/56607132058.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f5c60760a365d23789dab11cb7598f07/964591470.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ds8528p79jm8667luamn23oek3/11501996333.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/5114847632.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/43340891337.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/76613300744.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/15553419059.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607594a10a0d8---kilagufom.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/22406298426.pdfIn PDF document text
    • http://aquatherm-graz.at/files/76431909976.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28277449098.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076c77bec46f---kemamefuxinubolibomuzorib.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c58aea72---76049098850.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ab49d7ff0b7a2e7d8f255076945971ab/jodubulot.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/ginuxibeza.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/lapepisavam.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/16785329562.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b52798e5f7e9bd51a32360fbade1d056/wurafuseniwet.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/48177880788.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/kotivoraxoze.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/padedagofewilirig.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/vekexenuloni.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/67745765447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hdfc+bank+products+and+services+pdfPDF 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_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 17720 bytes
SHA-256: d8b0c9de7b71af2aa692dcfd04b25a3f3d797058e020882a5af34040795aa995
font_01_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 10956 bytes
SHA-256: 2fdc105701b71c1120f440da6dd8f2c7cec2ca6f39943009ff6a3685cb477391
font_02_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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