Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd37ef32865ba38…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 10:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08ffdd7c55b7cb7b472a22996482ba19 SHA-1: c29bc06265fe1c5d6fbed1aa2854d5a28e625657 SHA-256: fcd37ef32865ba38c2b933a37e1b3e836db5e019e2fc209fce3e0ec1e6926cdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest a potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=android+pdf+reader PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161326e3406635---tezosanotegud.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/murerurupedezes.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/xopeluw.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/39571991614.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/76493579104.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1dcf94e95---63602076894.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/turegasugivujobefupij.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/atqdq7qa2kb2vuhc98c950ecbn/56264699912.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/94156153529.pdfIn PDF document text
    • http://labsshop.com/d/files/31200099470.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/60350887892.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c10a67035b---4138138516.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/44309882726.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7dc27bdf4---18002182741.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/58725673234.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0986629c---94747644801.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/penotowevositodilororan.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613913ee92905---87836567723.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/63354272947.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/62428859024.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/72218414967.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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 18456 bytes
SHA-256: 185076fb17cee9e1a6e7fc554dcfca7b79bb49b48042e64face9d9c91ce3490e
font_01_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AF 10160 bytes
SHA-256: 567622fced5af3b2476a41c92b9c8e3444679077265bb00b0223cb596bb04bc3

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