Malicious PDF — malware analysis report

Static analysis result for SHA-256 d351fec974670afd…

MALICIOUS

PDF

98.2 KB Created: 2021-07-08 08:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f602fa47bb9241ec4e2c17b32da62203 SHA-1: 676bb44503f9714255d9352d05fadc1af23d54e6 SHA-256: d351fec974670afd00daa800e4cfb018e33e2e943e6cc159be48e6c2e07d972e
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier, and exhibits characteristics of a browser extension installation lure. The document contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the lure and the external links indicate an attempt to exploit the user into downloading and executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://wastran.ru/uplcv?utm_term=puffin+for+windows+10 PDF link annotation
    • https://tomas-music.com/contents//files/wisunigojigodew.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/wasoxuvobojaketiwog.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vulug04t8sv229r3pkk1a71mt9/29861562286.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1cb12c0f742d3da4fd83217b95ca51c5/kawaxowekopupakir.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7646ce94e55d41143a02beb0c8cb8e1d/5448933223.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/pafarutixovozi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a6acb6a63ab100a746c82837e93bb0bb/tibaj.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ce9e28242---55853831082.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/cvcb4ht6j0ll8oh97lfkkplv85/jebomulumavesivajolo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/3qdp31pq048r1p6iqng8vbdjmj/41539020942.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/lumerusejomaminobi.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/58395658101.pdfIn PDF document text
    • https://bauarch.bg/files/80870859097.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/05a60c1e4431aa4e65889dbca1209c47/87179120395.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2b11e438---riradiruxogazegape.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/17238733332.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/14057748160.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e6d6776978aaf9cc9fcfe563bbbac9bb/32345585873.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afb7448c1---10604920540.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160859747ce345---18152834994.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/55348037456.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bc97713f5c6095d6e31fe50414bee364/38669771430.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/tonomin.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 17252 bytes
SHA-256: bef6f5ff3f81c07e02d029085815448edadb9e11a7ba7065f67d42717cbf2322
font_01_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA4 12984 bytes
SHA-256: 38c7bddf720268b5c4697385b1ca7e142254b39a94039f65b29a42f741cb5be1
font_03_sfnt_off000163fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FC 10272 bytes
SHA-256: 7d8bee88ba69a23a12f5a5c7f48a8a22c89d4104ffcc40b16bd16467572e989f

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