Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b7cd199f8f1e51…

MALICIOUS

PDF

107.4 KB Created: 2021-08-03 15:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 41b775bec33c428addd924e2c1b4c663 SHA-1: cebd75103d4ebb9b0a59654b5686cb2e217c6116 SHA-256: 13b7cd199f8f1e51fcd943312a036868cc2cbc944c138e19bd90fb18e0d549f9
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 CMS upload directories and disposable hosting, characteristic of a link farm designed to obscure malicious destinations. ClamAV detected this as a phishing trojan, and ML classifiers strongly agreed. The primary function appears to be redirecting users through a series of links to a final, potentially malicious, destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sardavetri.it/userfiles/file/zaduwatugalez.pdf In PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e60bce202736013fe54c61fe3909781f/16422456132.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a54ab088da2526de347b44975d4e4c6e/87025580797.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/47979640870.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xogukit.pdfIn PDF document text
    • http://vodnik48.ru/content/file/lezewoxunusuzutonisowe.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9i9jt04u38n7qakd0hqm3putpt/buloxonax.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/7577194332.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cda539901d9---pozadaw.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a10e9e50690b728a0ae814bba69dc270/barudekobageruzedeleditas.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/1348794399.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/33360415644.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c413c6690e---zazafavogizal.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160715a6e8973c---genegopej.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104302814bbf.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1cda0cbb---gimixomenikixufefabosil.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/96dc4cce9872a52723046862f217667d/84393058468.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/2bd8oc0bh7um0gn6j75irha5o6/jomidigepabifik.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/14562581719.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080205269657---supezilune.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1aba1118---pavizewamowu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7f624d5ad41662d27a85b7ccc0996d9f/lolizojuzadumopib.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd417f2efd---veledowejat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+much+does+the+financial+times+cost+ukPDF 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_off00013f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15791 17812 bytes
SHA-256: 3a21010f9a2589c741bd7a5e1002ebddfebc7d83fef4d3e402dfdbaf90a097a7
font_02_sfnt_off00018661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18661 10908 bytes
SHA-256: 50013614f96e42f0a0b4ccb073def13b8b000ebec6e4535c0f14307984a2fa2c

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