Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b8a7925f2ae3bf…

MALICIOUS

PDF

76.2 KB Created: 2021-10-14 03:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 20dac0a2b880faed4a8516268e4573b6 SHA-1: d380850a03845f02631e3a35c1181b4e76e04d0e SHA-256: e7b8a7925f2ae3bf30a7e331e3c7db6420809b252ee5d2dcffa00b87d9a15e11
156 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, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://trakyasoftavukatwebsitesi.demowebsiteleri.com/upload/files/62702843697.pdf In PDF document text
    • http://abwlargo.com/uploads/files/55523330589.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/jevavuj.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161334ac44596a---wumolaveparixidogak.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/30991866987.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/75266789805.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/4880744687.pdfIn PDF document text
    • https://inarsindbari.org/uploads/rotulaputupatixo.pdfIn PDF document text
    • http://nineslash.com/user_file/file/82016466505.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/desaruxegi.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/pevulokitimogirideludir.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/39955218471.pdfIn PDF document text
    • https://legacytwirlers.cornerfamily.com/userfiles/files/simusofivituzek.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/42415121935.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/10903334114.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/verig.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161597750ddd1e---tatofimadej.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/21942525215.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/21039595872.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/64836607554.pdfIn PDF document text
    • https://badoza.net/userfiles/file/85270191633.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/xogodapinadularivud.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/vawarabubi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161605234a4e8a---xamalin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=advance+birthday+wishes+for+brother+in+tamilPDF 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_off0000c3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DE 11128 bytes
SHA-256: 4866056d4d04ac014cdce19c252c705577a90f6fb1e1e1703ab606ecf5b85f78
font_01_sfnt_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 17760 bytes
SHA-256: 150b0d3d2eca94238df2d0e61f46bc9a1e8ac8b3db698e0998a0baaaefe30406
font_02_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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