Malicious PDF — malware analysis report

Static analysis result for SHA-256 473b0e74f06222a1…

MALICIOUS

PDF

259.9 KB Created: 2021-06-29 17:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c5a79c567d4e07861fc853e62945f0f3 SHA-1: 7ff23cd5532010e0a09b68390171db64502e9d5b SHA-256: 473b0e74f06222a12e9c698ca2214e15c3d70289d224237e5c3871c5e46e4617
166 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 phishing or trojan payload. The heuristics reveal that it uses link farms pointing to compromised WordPress upload storage and SEO redirectors, likely to disguise the true destination of the malicious content. The embedded URLs suggest a phishing attempt to trick users into downloading further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://ats-dz.com/userfiles/file/65650907.pdf In PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/27915095119.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/a1ca9380586021cca550bbe858bfb12b/16229583358.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/19905298487.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/24250593b8abb447dc896b600517403a/10080014424.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4nkt02va58js5i79tgliakb6p4/95257594907.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964938b6259---tunedorefu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/20874348950.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07aa2bfb9b---70190592992.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/93lblft5qbeesgsrf1r98j52q1/79329521765.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160744a70e8eac---76746461952.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tfjb00bl0iur9uovolaq7apq13/64815317828.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9hhp5dtk8b1fu3is4eissjruo9/gasomodalo.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/kopobedugukesuw.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad2b8ac2b---41017017473.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/regemogodizeloroto.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0f29a84a976dc4befd99ef8d7c7373d6/wuzudosamuv.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ce451d97---kusufoxab.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i836le6hvia1r4595047banvvi/15829982898.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/36b16a1a184db797478a7f69eee566e2/10439074776.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5735bc6c90bd886f2c1525603609601a/zajebiroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=synchronized+meaning+in+bengaliPDF 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_off00039901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003b113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B113 21612 bytes
SHA-256: d6f624b8733686f3c66b8c30102a64ede850bae9cbe2dafd208f415bbbbfc1a9
font_02_sfnt_off0003e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E8C4 10940 bytes
SHA-256: 49ed31a5739b9377c82e5a0dd2b61383de73394f0c08fe9f9c4cba73d7437845