Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb66522ae79412d…

MALICIOUS

PDF

87.5 KB Created: 2021-07-23 06:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8ae632c97731e874a5a98e80a27e7ac SHA-1: 8bb330ea6c0ad6fb6db86bb39a460acc8cb70642 SHA-256: bfb66522ae79412d63aca04f2a807282e7ecc04bf4c43a03e37d369d3f1aea8e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hometeamcorp.com/images/usr/45943533226.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2425dccf3a---kemakowujimukomimozu.pdfIn PDF document text
    • http://www.centralperdana.com/file/sotexepudalotov.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/4982314542.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce1fe5bb5---dagedakepumaga.pdfIn PDF document text
    • http://belloverde.net/emailer/file/19997284068.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760b71d1697---13868041828.pdfIn PDF document text
    • http://veivel.com/userfiles/file/87185110399.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/49747492901.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/milozav.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/36403957156.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/44564307668.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/c27ef7f2115e99e49c2142a6b0e3a1b1/91188084316.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/14559050738.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/tagepilopekurijetikabi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366932cd1b---20489137917.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dmoo2dl26bciaf1v5m84pp7s42/lubodulakinamexapamuwuno.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/fomedalamisawibifasiboji.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607433c94060c---rikutinij.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/pos2736rgsvf2rktikhbhqvj9h/rokarudedefazazapuboxe.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a3db4fad61d4b4a5efb4a6de3f439b48/15059021986.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854ceca197d---zonisop.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/wegoxuramere.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080447a89e84---vegugixobafemavejidadis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+force+of+friction+isPDF 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_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10188 bytes
SHA-256: 2c4bccc6274866070ab2a83337b3941e6c5517e65f12c0a8f59b3c71835d26ce
font_01_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 16928 bytes
SHA-256: 63126dffda1dfaa768de2d9615d706dee9824a1bbb29ac7dfd1cbf3a9aa6f132
font_02_sfnt_off00013731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1