Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d754a7f7e7b79f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 06:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be5b4ef93c5ffdcca02e75fc055af844 SHA-1: a7de5cef1861b1e20ccfb9c339be6a8db8202ce0 SHA-256: f9d754a7f7e7b79ff35b603601584c0775ad6b7abd99a4574806f431c0a69141
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for initial compromise.

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://tns-china.cn/editor_upload_image/file/65014995596.pdf In PDF document text
    • http://myucmas.com/userfiles/file/38965323005.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/60687748081.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109022004422712.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/221d992547ab70bb030ff9307653a79e/21040294932.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/4025471906.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/65009483781.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210914122242.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/munuj.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6c47b9082a015ba1fccc491069c21f4b/64494212410.pdfIn PDF document text
    • http://zenithmetals.com/files/dulifibajegatarolejo.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/55967995945.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401f0dc84de---damemewudosazatulo.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/72710135738.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/17530054656.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/pujelirodurubutotilosas.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/53837381482.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/losajuvaduki.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/arfdm76tmk8066fjafkmc1dd61/39817828811.pdfIn PDF document text
    • http://azizolace.cz/images/file/zarezumoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=comment+augmenter+memoire+interne+androidPDF 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_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 19068 bytes
SHA-256: e7fa94fb05b415c3fec6ec567399fe98a629bc2466add2c6f5a1892e7bf9a1cb
font_01_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 10508 bytes
SHA-256: 5534b9d92435cf44d64228bbbd0a58d3cc7f7b3047c82641c5c020908f7a519f
font_02_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1