Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdc0a8cdbdced89…

MALICIOUS

PDF

97.2 KB Created: 2021-07-02 17:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aab66b9d0c3c6d4a97de2f5089fa7be6 SHA-1: cbcbe046891347f8404e1a62466d6d9c3b65a6c5 SHA-256: 2fdc0a8cdbdced8946040866e97633a50015319b35e4a1dcfc83358f98327a12
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple disposable hosting domains, suggesting a phishing or credential harvesting campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to leverage SEO for potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://evergreencans.com/userfiles/file/mabofivujeboxinoloka.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/9a81f9039bec72e6a41dc283171dd4f4/sadojovedego.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ad0802bd5b45a2c607e1f3f927212c74/lofemesox.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a608c443c---16206088305.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfca0ca2e---66609712054.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609237e996df0---44683808479.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/lonenoz.pdfIn PDF document text
    • https://armenia4d.com/contents//files/muwawapotaxakaxuvepup.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/rigileledegiwovugat.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/79577896884.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/it585rio3qigj7ba0gmd3chnhg/navazagesupifofepizadig.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050850053989.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/36455415852.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a1cabd3a---89710606438.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/tajovifimipabokodef.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160724a9d00b1a---1213438479.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f96ae35c2---98273949293.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/bdc0e43d70ff5ca07561e2ff00a7fd5e/35000719459.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/38686497604.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/426f7cef30e0be6f14e22798115a8761/23357671896.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b68cb669---bonixapevuvixatesefe.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/99064516475.pdfIn PDF document text
    • http://tfforming.ru/d/files/48655769596.pdfIn PDF document text
    • http://artospace.com/pics/file/58498862318.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/xokorunimevan.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/vlhm0tdghib39629ob6lpudtd0/rufibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=theoretical+perspectives+in+developmental+psychologyPDF 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_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AE 16916 bytes
SHA-256: dd91bb26bdc70f62f5738713345eb31945673e7c8168203be591258119e14dec
font_02_sfnt_off00015d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8D 11104 bytes
SHA-256: 74d78850974cedce24474476ac4ef91166bacc3b32cf665e9cd1a9bebb063d72

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