Malicious PDF — malware analysis report

Static analysis result for SHA-256 c410a848cea064f3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-14 14:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e11f1f5ab54d5d95884839839eb6dc32 SHA-1: 67c69351a102c8a6f7ff8b2d09f13dc8c583effb SHA-256: c410a848cea064f394302794292aefdabbb7dd08e40fb42da9d76043bd016dc8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://accu-split.com/userfiles/files/28119014834.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08bc89945---pemenikil.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082b569443---46644847398.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/35239424529.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/2006849065.pdfIn PDF document text
    • https://dacola.com/upload/files/11820617964.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/sujetufof.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/soforanujuvopovixuruz.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/75714519203.pdfIn PDF document text
    • https://salwangurugram.com/files/89653706939.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/mawubadunewuvati.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/fukow.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kamixirowekafiti.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/37113613894.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210911051054.pdfIn PDF document text
    • http://mqskin.com/luutru/files/88677364391.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/45129024655.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/vitinedudefuruzeb.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210902132913_1071783210.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/xovuwukofudi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e6b0f800---tevow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=icloud+reminders+on+androidPDF 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_off0000c142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC142 10484 bytes
SHA-256: 917e4a43bf267ff69070f533ace6b01ae6570e0a69fa297cf9a8c7759cf32277
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 17072 bytes
SHA-256: f1ceccd3522120948519fddae197d808d5ae5770074f2a79cdeeb2550b9800a5
font_02_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1