Malicious PDF — malware analysis report

Static analysis result for SHA-256 226fe5d97336c737…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 14:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18e557cbbd4a2153929a4f5a2cfca60a SHA-1: 886a16bb412854c64295d4d04036a304dd3b3502 SHA-256: 226fe5d97336c7374e6f98132c42c4c1765aa46052be27e50ff0fa56ee75b8a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm suggests it is designed to lure users to malicious sites, potentially as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://usa-ex.com/jinoxiwufurobunavalame.pdf In PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/34fcbcea49582a23e306429a8462b4dd/15878767592.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db64fe14f6---45352658293.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a5c286ab---18760216233.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/84300800400.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f47d97b0819dfd029468e3d7c660da78/gotobunimavojip.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021060912273918.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/6063183449.pdfIn PDF document text
    • http://innotack.com/userfiles/files/vasusamofal.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608044704b232---7397383790.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/zuduse.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/kudun.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/24893825903.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16082de86424b6---35406030915.pdfIn PDF document text
    • http://soles2walk.cz/data/file/21715339800.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/it7b3l2nl8kc5u6e4umatcpto1/70984612173.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/11738317893.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/videgimalojibobamuzor.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vv4c55a58b95r4ovns2pnc4bp1/93948469003.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/taluneveriletugoku.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/gevunusomogewuru.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/24034847352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=at+commands+list+pdfPDF 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_off0000ce74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 17412 bytes
SHA-256: ae6884c669c046787d277448a1819dcc30be694ec9095303db023eb06477badc
font_01_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10528 bytes
SHA-256: 86ebb8ef54c5a30877098fb3276573cb2b5025257bf147b877549d98ffeb1911
font_02_sfnt_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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