Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdba465cab144c3…

MALICIOUS

PDF

64.0 KB Created: 2021-08-22 07:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2a610a91a27aaf46aba89e5c6c1f63a SHA-1: 327122bbc7232c5a9c9a0be36570fae0966a3951 SHA-256: acdba465cab144c3465df0fb667974553c42e8ded03eacc6f3e293f708dff5fd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms the nature of the document as a link farm designed to leverage search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9661

Heuristics 5

  • 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
  • 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://amirep.com/wp-content/plugins/super-forms/uploads/php/files/49d98adc85dd74309cea7672d06dbd2a/99909923813.pdf In PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12588023603.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b61984acdff51233a057f1f502389b22/7266466500.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d40fcdd3a7a789210ad7f5da83ec5984/27017717601.pdfIn PDF document text
    • https://melz-feu.ru/upload/90040760697.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f63eaba7f12---baxilone.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c87e13d7d---sipifixurelal.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/mujumo.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/19412390666.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5s9ofqhfltionto05olafhe7qa/madinujegit.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/43702380595.pdfIn PDF document text
    • http://agrion.org/upload/fichier/barijovuwomix.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/9614433023.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3bb8d1d3---64334182214.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c349cb5e8c---34512511996.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/rupupovatawevejutusenu.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/75861698253.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/fonaviwupulamejawipofisoz.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/gesirixibolikuke.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2d7dfbee777faa4f8c4a79f9d0dd8cac/95380527618.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/voner.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/45501729962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cell+organelles+worksheet+answers+page+3PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 15508 bytes
SHA-256: 57d6ba26fe0a4b508a2680e274124f3bcde0db54996d535fd52da66fe26e4e31
font_01_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1