Malicious PDF — malware analysis report

Static analysis result for SHA-256 736ac329613520e4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 03:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e367a773d244df6bc702563b5350bb9e SHA-1: 601f01257288416b4c0e27c352adbcaa4f904339 SHA-256: 736ac329613520e474b89b2fc6a7fc65f82942e05a9b16b77d3da7edbee5b0c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these external links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lnianemarzenie.pl/userfiles/file/zifawesiwejigerarubotalol.pdf In PDF document text
    • http://architettoangeli.it/userfiles/files/binurusitojenafiso.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/63913860340.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/porufalenofutelefopele.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210605_B8AE9E9E885C3F9D.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/zivog.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/17057459954.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/31314928318.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc30e478c2---62624770612.pdfIn PDF document text
    • https://j26clean.com/upload/files/35292041745.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/tewilugusepibapiriv.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ca8663407f5f76de765d207185581c82/xewavex.pdfIn PDF document text
    • http://sowitech.vn/upload/files/teviwowofaxujukezixomuwu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/kq0mgpflouglrr0eau66aum6m1/49722719491.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/67217108749.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/nezesugetupasazuma.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/br32s9s7lajt3jvce08hhfclri/geligexilufezufujo.pdfIn PDF document text
    • http://crm333.com/documentos/file/moletixekawelukexo.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/pepudibugulopaxitimuwoga.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cde64c5888282e31454e53ff10ca562b/51170342773.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ac14b03f84a8c36ba58b0ca944c4c143/togesebulog.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051723221956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=normal+pulse+voltammetry+pdfPDF 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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 18264 bytes
SHA-256: f787eed8dab996154804acbf4c9f2b147b6e7ae7c1d66a1eeb475e888bbe5375
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 10720 bytes
SHA-256: 5fb7df74acac97561dcb0a647fe35395f2ffe2a571a82c88093154e4e530c1ae
font_02_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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