Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc33cde729bc996…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 01:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c766ed77d54becce77fa75a96d61592 SHA-1: 2c7b8511e3c7e0b2fccef68a3f26919bd06cf4a6 SHA-256: afc33cde729bc996ff6ab8c078025913ff74cc6f6d1c4e90e5fd11e9a6fb75d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/tosanemular.pdf In PDF document text
    • http://cocoon-source-harmonie.fr/public/file/3434737290.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/kalamomakakutozop.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/ganuji.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/48258374573.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/27584926407.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142e203c565b---putokofarifukajanik.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/20713496218.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9a2a9c6deb3b2f4cd796a4fece61ecac/939077006.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/84414168010.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/lorokiwovazegolarakuzi.pdfIn PDF document text
    • http://zxsolar.com/d/files/71602833560.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/4678650279.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/15bdd64e874d5cf8f6c09c7464ea7ad6/80487163524.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/28474299020.pdfIn PDF document text
    • https://botroul.be/uploads/pazerilujeposejaf.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/nuwerexavanafol.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908105816663053.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/nerarezigimule.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gexurabadevab.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/68375537381.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/nelamuvefane.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/c61f9eec82d261ca5e57cf6388251139/ruvajulepub.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/kiwavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+7+ultimate+full+version+downloadPDF 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_off0000b138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 10808 bytes
SHA-256: 0ca0ff2741eb8e04044d8ea3db3d1056ab282d3f4bcb3d02f2f0c4a3d968274b
font_02_sfnt_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 15232 bytes
SHA-256: 1b184dd00b0ef8cd7c478b1313b4d184fb2e0fd8a49ac4d38ef4f3f57da1050c