Malicious PDF — malware analysis report

Static analysis result for SHA-256 36697e20b53285df…

MALICIOUS

PDF

85.7 KB Created: 2021-09-08 08:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8f89b72d2410cfb9d2bc41661b64774 SHA-1: 739c22b3328104d780dfe2544dbef2efef957e08 SHA-256: 36697e20b53285df4a70a8222140a0f230789eb653bb49bbc89977f2da77882c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. It also features numerous external URIs, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=numerical+rating+scale+pdf PDF link annotation
    • http://barbusci.it/maisUserFile/file/24812991940.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fv5j52760rmfqdt2q5u4pomi8h/44749640195.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f27c5c0e---nipaluxexikegirarado.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/34959231fbcfc852a479cc42b48ea1ae/puzudirogomuvosovagovure.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/586f64eca5dc95175cc82bc4244a5891/vazutinoxunimo.pdfIn PDF document text
    • https://kenadong.com/contents//files/84558610211.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/papirenaxalusuv.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caebfec0fb---ruledimosoxakol.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e51948fa5c9dad0086d47100aece34c8/99435689331.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/norupe.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e831db816---wizalinotidej.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/621121338.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/65977077865.pdfIn PDF document text
    • https://tomas-music.com/contents//files/jozijiz.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/mamaje.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d96c8c43a26cfb16fbbbfbfd21416d33/41523012336.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lejoviwod.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/xuvaviwiwaxuwado.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/443f222002e8920e3dfe614bfe11acd8/sebogofawufujus.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/nelugabupi.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/bipugupatufufufe.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/laragifebasekiropevi.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/wejagapibidupetelojamogor.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cdf6bf3565127d5ef2f3564c05e2a237/56117303346.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 10920 bytes
SHA-256: 4a2262a31d2640b27dad136ae94efd3b6869f73dabc258b14f2c862f9f432618
font_02_sfnt_off000117c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C5 19168 bytes
SHA-256: d23ac6a12f9c8ea0c2b6b84a742089df588d635dab299078c6800e2f7170c1f2

Open this report in the interactive analyzer, or submit your own file for analysis.