Malicious PDF — malware analysis report

Static analysis result for SHA-256 b760742d7e12c274…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 18:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb872db3adb3ef78093e56b8f41d9b92 SHA-1: 09ae2df9f398e6a1b621fba59194bcd72e2323bb SHA-256: b760742d7e12c2747f70bb27053ff6e37bd6a4217c977742d15b65151a2d692a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One URL points to a compromised WordPress upload directory, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://botosani.ro/img/uploads/file/nozuk.pdf In PDF document text
    • http://mayingiabao.com/upload/files/14743525958.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149606f98d7b---32550309255.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/wibopanorenokukax.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/fazuluw.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210919113523.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/zipovedetarulutefi.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/petizasoginibanaz.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614852baa8c8f---veniferamevosi.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/63131401116.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/mefuvufejegarinof.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/78898800342.pdfIn PDF document text
    • http://hongdacable.com/d/files/72581114903.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/61719855206.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/jaxokakegeroximisu.pdfIn PDF document text
    • http://imaginove.eu/data/Files/88186352010.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/59857791255.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/kusasipebezano.pdfIn PDF document text
    • http://glassick.com/userfiles/file/zetelibufomidudabenuj.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bef95d5024---ponudu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/69hhfqh03j9kp6i111dpsq05h6/16356629769.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/dofirigogozupidelexi.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/45796152112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=vr46+wallpaper+hd+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_off0000add5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD5 15028 bytes
SHA-256: 2ea9cf59895c94c07b01c7d5233348cc077a2fcc7a960821391b31bb1265d312
font_01_sfnt_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 10524 bytes
SHA-256: 92b2ad1df749c8b4a53c976a750301746929af179b111aed1bca8a33637c37b8
font_02_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1