Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d721eab1e55219e…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 17:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ec10b496acf178b1c0115057a1ff4291 SHA-1: 93479f05db92c4a9b9973c7d257a19f6934769f7 SHA-256: 8d721eab1e55219e08c1405aa4992233e1db55acc45a33f24def99496ab5c048
154 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a likely attempt to redirect users to malicious content. The presence of these links suggests the document's primary purpose is to facilitate initial access, likely via spearphishing, leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

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://weblative.com/wp-content/plugins/super-forms/uploads/php/files/i2da1s2r1vci637f6tkk9cgn8i/noxawa.pdf In PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/50a67d543ac57902f25e7b432dd4d2bb/ferawapafotonej.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/23684290165.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6abecc9c545a51a028c674879c7b9146/33334091830.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/xoribapinevot.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99664550845.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/witixebivuxinimuxuwo.pdfIn PDF document text
    • http://medi-sen.com/files/files/66242702736.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/33773894757.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/mudiximi.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/53624279396.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tetemeronoga.pdfIn PDF document text
    • https://castel.ro/userfiles/file/67539084042.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/84118014729.pdfIn PDF document text
    • http://airsoft1.ro/files/file/93103393178.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd70c7e9e31---gezerorevozedaw.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/58365274529.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/muxuvewumazeji.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/korix.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d7dd965933b---15873861347.pdfIn PDF document text
    • http://france-ex.com/919409292.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/40254398276.pdfIn PDF document text
    • http://nanopena.cz/upload/file/nuradonivanovoke.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/foxexafosupotosubarekezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=federalist+position+on+the+constitutionPDF 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_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 18276 bytes
SHA-256: c2c6dd09143135551e444bb9ebe7633b41272bed72b796d80f5756f4dab84ec4
font_01_sfnt_off00013472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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