Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c82cf6270a5738…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 13:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5be076e5691389298242095df870714b SHA-1: 31b8c0aa2f6ba85e8049778aaf8c5134002b5f13 SHA-256: 17c82cf6270a5738a1ce30e4523270a680e776708a99a200459ac773c54edd5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://fisioterapiasuzzara.it/userfiles/files/53606100145.pdf In PDF document text
    • http://ricettebiagi.it/uploads/assets/file/pozimajururefudeme.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109151452045623.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5jijhr6na3pqbte2j5f68jlni7/fuxijujiremezobip.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pometasulugow.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadeebb232---kowiluguwag.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/81640215496.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/97967949900.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/14804221076.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0c2baabf---redut.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5mbun5jmm5373mpjv6654vc2eh/67330916950.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/jutida.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c6e9c39cc2370a4f5836a3c50f16324b/15498533928.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/xutisiwagabakowekowigapi.pdfIn PDF document text
    • https://esvigo.com/upload/files/susomato.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tuvajoxari.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/doturatug.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/67684155992.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/19204348980.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/3144136358.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130abd0b21da---6681485647.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/73089685230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sat+test+9+answersPDF 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_off0000c2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AE 10172 bytes
SHA-256: 7a9cc8cc3268acd52534d82891886eb85ec23b4bd1d4a63416847dc1f804ba6c
font_01_sfnt_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 17396 bytes
SHA-256: c532fe127aa28420e73fe0e78aee49702b3fb66ece24c6b166a1da96c31d7237
font_02_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1