Malicious PDF — malware analysis report

Static analysis result for SHA-256 6071d43aaa8d6547…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 19:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: daf376dbb40efa6ce0c44ba6a7570c72 SHA-1: 480a69932fcb78ad08b15b01b5b6eaee7c243f4f SHA-256: 6071d43aaa8d65471b4778278c1434ff9088dc2095fdef7f2cd13a32fd7b4009
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5842

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://medvor.ru/uplcv?utm_term=best+truck+simulator+games+for+android PDF link annotation
    • https://ip-pharma.net/data/files/19647663677.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340a4bd566d---56003597418.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/berenuvejibivifunoz.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/felitatujupisiramo.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/denafojiranoriwodilis.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/14271820917.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133437248371---fifogifuriwon.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/95339798927.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/c49pq7kkpq6lnh2ese7v6fp0qd/86887105637.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/rewukeduwepo.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gijofowixegowanene.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab6d77ea43---risagofeworaz.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/40703106260.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/75685201054.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767bd8932e---remele.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/suxipo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/764158b08eca8ab786c3e500c3c5cb02/pijilimujafefeke.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/tufazarinil.pdfIn PDF document text
    • http://zimmerei-possert.at/50333065884.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/58884417626.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/92309088323.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323b55f3b11---49785795424.pdfIn 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_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 11064 bytes
SHA-256: db8a0c3f6e92d4ec4991b63448f9b354ff0f07eefc82e56accf7f9dc106d4437
font_01_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 17872 bytes
SHA-256: 3afe840815b3b3bb367ae354e47eae39cc331b7d0c8e90e0e8f5865ad661ecbd

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