Malicious PDF — malware analysis report

Static analysis result for SHA-256 873033a3addedb1d…

MALICIOUS

PDF

79.1 KB Created: 2021-07-21 17:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2327c90c9e3a28ec7a4dac034ae5a6c SHA-1: 29f9a7ce9953bb0f093ecf855f75cbb6cde52f3e SHA-256: 873033a3addedb1dbdad1f487d6f3b6e7f77abefa99778f2940d430b195bd3b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious intent of distributing links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5182

Heuristics 5

  • 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
  • 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://aravlicraft.com/cmsCart//upload/file/57241179603.pdf In PDF document text
    • https://addsfly.com/userfiles/file/30710819698.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc113e78d---koxezoxiki.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/tubakidi.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/xopekixima.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/33255934794.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c258b044f16---nenoletasakanulajo.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1623317785.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b76569190d3---11621261708.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/71571742184.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/vopekinofudidosonitagovol.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5212190ae4be68a2336a0c771c416dde/3551618232.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bff2b2d52---kizewesivem.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7e436fab22d44281415fbdceaa90283a/jemilupemis.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/1299234486.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ef4f40e64f29156d20b665a44d869a5a/60120408035.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/94194634355.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/nijilopunasiluxijitabef.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/59202357039.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/48c11442cea2b31712dfa7fdb1b3f071/69004799801.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/muxivotatinizoba.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/gufukusuzomujuxopoxad.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8160a98393---xutafejuj.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xonaded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=contents+of+hr+manualPDF 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_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 10516 bytes
SHA-256: 1416a0589a93bfd394fe18159d1c723a0d893fb89f024ce7e72b620906e4ef79
font_01_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1