Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9a67505ec89589…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 02:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2733be73c1e700282e0daf4cad465ee9 SHA-1: 6b82ae06ff07cf8ba83dd99d0ade6b6a6279047f SHA-256: ca9a67505ec895898d9b68f83a95bf3b31d9d18e30fbda5a5f403f17e2f6eba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=sign+in+to+outlook+email+address PDF link annotation
    • http://saeronbio.com/userData/board/file/14642516036.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/27986493512.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/gujefimoxawez.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161401ed943f86---23008043920.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/59160831447.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/fabazojo.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/40755900950.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16147b71082505---pupilasinere.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/40824286298.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/dipenelex.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/gekoki.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/68556668817.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161445509f23ec---32329108426.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/nuxazin.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/dudetovix.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/10192222572.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613590b757f35---tibuxulexavivebomavafe.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/zosebiguzawewojexaleponu.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/rodilo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d99dd361a741e872c8f3499fa1fb645b/51793330002.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/88478435852.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/21160389187.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/dakelowivawabubeloput.pdfIn PDF document text
    • 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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 17968 bytes
SHA-256: 4a82511314b2e15eac29e5c10b365add973fdee7322e3c0266f289043d200062
font_02_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 10856 bytes
SHA-256: 9caf6ce3671105984cb7058f84195a867f0eeaa5adaeb7e2f3085caa094a58f2

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