Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ef47b0e6800d76…

MALICIOUS

PDF

71.2 KB Created: 2021-09-12 02:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f45098166665c44f0c94ebf5381f8f5 SHA-1: 3ab0f1312fba1b130db29c2658c8216ff547fd85 SHA-256: c3ef47b0e6800d76413d679006d8b20a43a17f8e75c85f80847f9c651cf8bf42
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to potentially harmful content through these embedded links.

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 https://milorem-service.ru/userfiles/file/jixukurogotesoxigujo.pdf In PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/62353113852.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/76710204598.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/98571633922.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/20753007146.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/tefebotifudotuwor.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/rowefawafusegirozaderaz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jm1o5kefl71qvs0qjrv1s9o1p4/tetowodasoj.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/jojatasibum.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/25340149976.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613913f0cc492---surezozubinimawumorov.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/fenexavubub.pdfIn PDF document text
    • http://hydrem.ru/images/file/18072685533.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109070925264598.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/41297661976.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/wisunudipebedusi.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/wovaxulijekegiwuveg.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/98042452170.pdfIn PDF document text
    • https://geloracinta.com/contents/files/43912199929.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/14015558264.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/xizid.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/botad.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/70014693073.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/89566425040.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8bea90ea---10440058021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=light+pdf+reader+for+windows+7PDF 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_off0000b706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB706 15176 bytes
SHA-256: d3b7ffe5ed3f45c6e668c2cec505b02eb1847a20ceb1c770de5c483c7c4ba968
font_01_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 10824 bytes
SHA-256: e850207b6a048e38627427d4e147aa966aca06e69d920188a6fc696a4d1c6294

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