Malicious PDF — malware analysis report

Static analysis result for SHA-256 9678a2a06c504174…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 16:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3673a0a5974d019fbec8b4e8134ceabf SHA-1: 8947dbfee82324cf11b560190be714e1e3f8d0b9 SHA-256: 9678a2a06c504174a0a67588ff1a94c537f979fb7399a8b609d1d9cbaba44263
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://essentielles-theater.de/UserFiles/File/rusudokiriruj.pdf In PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/silukozisomawezumoj.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090822574218997.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/zijomixagetegugu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9763e73e3---12742414176.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/jalizesi.pdfIn PDF document text
    • https://12shio3.com/contents/files/danijujeduwilupogamowo.pdfIn PDF document text
    • http://hangquangauto.com/files/bodaxivedokadonobo.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/53339085300.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/84315165040.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/folimage.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/45922654920.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28bf9a8d0---zuwumowedap.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/47441662395.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/13510551759.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132c65f52936---navizexolerekirorukobux.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/2394708961.pdfIn PDF document text
    • http://linza-market.ru/upload/files/wofujogesewakak.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d3644b48---rodelixoboj.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/40um9gri2ppvqf29jeq6td6u12/nilemivilimusivura.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/dopobopamegatun.pdfIn PDF document text
    • https://andhimazhai.com/images/files/97121675060.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/2679013771.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/jixekebe.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/diguvumibupaxuzopesosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tom+and+jerry+maze+game+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_off0000c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BC 10588 bytes
SHA-256: 43ec495633bd16fbdb485bcdae58f3822d9398dc9a0597ead442cb6ecabac4a5
font_01_sfnt_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 18988 bytes
SHA-256: d09841ad43956ccab71952365906477f9a9df03a3a009141e4affd099854923f
font_02_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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