Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4c5b96a48253b3…

MALICIOUS

PDF

78.3 KB Created: 2021-08-27 12:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 451e85872123fec70cac6e66b96be45d SHA-1: a077fa376269395a485f8277f82a9ecc40673028 SHA-256: ed4c5b96a48253b35196ccfc67a98e6f290c8675ec1af0f209a472f38ea1845a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eyetracking.pl/userfiles/file/56661325372.pdf In PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/pusopuji.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vubumimezitijo.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090404664e3b---zijefumowabijexew.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5649118e6cb7560264efc60601e563b0/36642097762.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/33b36a3a486a99878ca3a0cf780366d8/wovulitumemegajejebilas.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387c3a509c---fulesalanokidujipujimet.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/48818970717.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/mobuvolowofixidutakir.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/52052134313.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bbb2d6fbc---75373223482.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/14238143646.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/69812022347.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/36532616112.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/2619431460.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/vaxaxetigurotu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb0fcfb494e131a721df5478abb71a4f/gukuxepega.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ofdcv1tutpea6ilkmqhp15uf45/5161468224.pdfIn PDF document text
    • http://modero.vn/upload/files/fusuwomewijipowomolopaba.pdfIn PDF document text
    • http://starsunited.at/upload/files/vogumupi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/10007878496.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/muwazidoz.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/kogetini.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/zetudozejiwejol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=correction+of+errors+in+english+exercises+with+answersPDF 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_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 16908 bytes
SHA-256: 26afc8504627c4336c78ae5688538a767a893807c2e85350b2b0ec4d2f3b7dc1
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10836 bytes
SHA-256: 0e68f97e861050a757ce5d902091a2cd37016ae31e7da74b99309a91a9b64775
font_02_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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