Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8315ccf5062335…

MALICIOUS

PDF

101.9 KB Created: 2021-09-07 00:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffb9281106e29fa05ba576dcf5f3614f SHA-1: dda6f3db82751eb47f35b432cff9a07c12f6cddf SHA-256: 2f8315ccf5062335e077b35a19f3f7762ec12f923295fe3b1cb72904dd76a5fd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=statistical+physics+reif+pdf+download PDF link annotation
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pmj92r8umup8gcv25pnatg9v5u/85637233656.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd27f68cbc---40895029617.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1f2d1122a0e59347cda08d0ae0bf10d9/mudiwidofujosa.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/19615018347.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/labazajojazixo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217d87b8a82---rimoguvabusatijitikov.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4354e74d26---gunoroxofakawe.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/30002259528.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/58732453103.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/bizolovur.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160999c7b8bf65---wapomuratejati.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/gitibifepikagowuri.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/zenoxokazax.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/feribifosetureze.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc428c1b4---nuvine.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/mezuzaxi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b0cb2c820---kapusixituwoxazofivolof.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/dabunotekexijobewoz.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/nopotusabunijipekan.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/netujupapisoluzavis.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fofeganizalo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097084673549---83487948079.pdfIn PDF document text
    • https://tcremich.lu/files/files/23297738973.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_off000120e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 10992 bytes
SHA-256: 7b95aec5dbd9d1f88d59db93d3c34cc4fbad6294f4875138086a427996df9b93
font_01_sfnt_off00013a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15279 20808 bytes
SHA-256: be5808c9580047d777dd6a4185f42e7defda766e614c9528b6995440920ea038

Open this report in the interactive analyzer, or submit your own file for analysis.