Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f8a7f91021e435…

MALICIOUS

PDF

79.1 KB Created: 2021-08-17 00:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16c06cf0237f8ef8631d1cbeaf798cc7 SHA-1: 9bbdcd8377266f63f26d1078b411be27046f03b1 SHA-256: 98f8a7f91021e435c56eb992986201ace4b099838768f7d838fe974016c6bf1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or malware distribution intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kocavietnam.com/upload/files/6101701910.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8cb5aa835---wokunurebumunine.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0739626e8173c7834168da58e01e3367/tuzojamakaxipososuro.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/66299049167.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///zirefonalaxufunebokalo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596783fa97---27296844831.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/13466950540.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb3370277---lapasedujajonow.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/719973871.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c96773a8---gimemiwazupabotogelowoj.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bce9a27de66---59677594061.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad3285ec8f---vuketetajeviwa.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/59527964620.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/neximolarasefirufa.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/96630854110.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/lavefob.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b683deaf110---mutulebo.pdfIn PDF document text
    • http://mobitransjogja.com/files/sixufobirerekodizep.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210607173404595641.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/vusakavojaguludasalukivip.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/35797412575.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/rupamano.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d7bed5a7---lilukuwudololo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e4582230421---86190118203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=isindebele+dictionary+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_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 10820 bytes
SHA-256: aa92ab5ddddb3e3cd269f9fafc2f6387297674784d0a7620d2e3a7735b5c3d33
font_01_sfnt_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 16848 bytes
SHA-256: 03b3a09d65f57e4ab9e9c99e162c959729eeffd1126b199b90dea8e911a629ed
font_02_sfnt_off0001164e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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