Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a66be7ec03ca76…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 14:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0cd3a77f4a53e85cbcff1657f00d2ed SHA-1: 9f46215cba5e11e442ec7f88f386049adae72579 SHA-256: 41a66be7ec03ca762002afde8bce6e2e9e7fabc5831db71766cc09aa221e7a75
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content is designed to trick the user into installing a browser extension or update. The presence of numerous links pointing to compromised CMS upload storage and disposable hosting further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall pattern suggests a social engineering attack to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/inulno0fg7525rsrfsce8re6b2/85417246528.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0ad8be6866530a0688920da0cdb40dc9/51314149536.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/duxijuxobos.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210811_145759.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/83574661208.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2e2652a54---52685344292.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/xebopobuzovojoruxaj.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bedacbbcf---lipagamafizif.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/74795821942.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787db922dec---babewurilasebukumuze.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0c442b412---kobekabisibosaseji.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/jozubuxa.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/3562969085.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3424a5ccf025a451553363c4a54a8ea5/xixepesavegasuvoviget.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/12265953015.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/28471165308.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/11637884409.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/78147856846.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113fa918c9c3---12293018200.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/jarigajegupena.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5fde71d37a8de7e16a441a922d00b003/44708468676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+compressor+to+250kbPDF 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_off0000d57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 10988 bytes
SHA-256: c7cf107a809c9efd106e0f8dde7997eeadae5640381cf09d45d51ea1beaa6b93
font_02_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 17384 bytes
SHA-256: 82039a38fe06bf74b10507994ecfe8be2650b825ace950b039ed00face01259b

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