Malicious PDF — malware analysis report

Static analysis result for SHA-256 146b9f0d0268b0e1…

MALICIOUS

PDF

99.4 KB Created: 2021-07-07 15:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a23a10f6dd8a85bcc52b6385eb4245a SHA-1: 2a88f79a3766d9493e98a3332d966f21590bdbb0 SHA-256: 146b9f0d0268b0e1f64aaf351f4fc733fe2ce1a85298a079c8fb0c4f178dff96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. 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 embedded links are indicative of an attempt to exploit user interaction via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://crysiq.ru/uplcv?utm_term=watch+dogs+23 PDF link annotation
    • https://lose-weight.tw/upload/files/kafugafegatuxak.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ca21b01caa3---42466925525.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/vedekuboput.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/194f5eaba9b062bf75bdfaec59a02343/besifewitunefolugufilup.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160989efd05c82---89429322495.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df4d9549b7f---54648335816.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/74360959c819c0163ee4c59011ce329e/83745477999.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/donagalopoditomojixewefa.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453df27134---82193742013.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/xatudokataniruxexud.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/limikebejomevovunerir.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/08c4a46bd8004528d9931645741d8434/ronunuwusawabimiboba.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/mezinokinutim.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/88001392196.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16094be1f09ce9---5668559550.pdfIn PDF document text
    • http://billsky.ee/files/file/xatumugene.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/q3jrm6g31nacirpcmsuqlcl2rd/mafiz.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/bf2aec379d054f6bde76ac9ab988a1d3/warobojukarumiwajadepaxa.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/56446305207.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf890ce7342---65032641685.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fcf29b34---zuvusikotoxojodas.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/xibesozitujup.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/jusoditutamesanes.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/p1s34m50abrh138jllum57fma2/vapadalijesudupujixu.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_off00012539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12539 10460 bytes
SHA-256: feb876e4416a6d703a7df27fb61dc777c5ded37f59b0083929fd7187dd06fb3a
font_01_sfnt_off00013d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15520 16864 bytes
SHA-256: fa7dbad31b672de56467053e525bdbed9a90c23e0820b0eaa8f1e36c542446f6

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