Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96c7ef98a0ddf7d…

MALICIOUS

PDF

86.0 KB Created: 2021-07-31 12:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3245fe963bea28931da74e632c0a5be7 SHA-1: fc856edf8339a241f8a35efba9e69e41a6418432 SHA-256: a96c7ef98a0ddf7d9b83f17fe015d042498b80d4659fc52beb426ba22f591d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://ketchas.ru/uplcv?utm_term=stick+warfare+blood+strike+codes+apk PDF link annotation
    • https://dusunceokulu.net/resimler/files/32770431297.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/nevetosesitenaledasedu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/19809336086.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/acfb3df22e18b9adea80a2987b343fd7/89491141764.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5717ba61---nopifafazipepojijitu.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/dixidirufotetabaf.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/49baa7ff5458e92f59faeca7ce0ec4d1/gobezalinadanejodof.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce3e79e70---govavikuzujigojebevaminen.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f59fbdf906---polijinudonerav.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0b612079e---44570039638.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c425a1f793---bozeniwilekuna.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084c68219203---74950650923.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a572a4cd1ef---tafoxi.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/72064270290.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ckr4glsu69bf0js01n0dvikjlh/67687181155.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b50496d7c12---61909756008.pdfIn PDF document text
    • http://alltechsro.cz/files/numelilosasigoji.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/58288547a8e558cf68d49cd3fdffe057/56729600857.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052905355687.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/fujaguloxivupuvizodurura.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/3f40b752f0052c6750cbdfd880c8ca46/63143475760.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/230a1e924318bad15e8beae988ac8412/3248350251.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210705165555.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda23704d0---76045836004.pdfIn PDF document text
    • http://agrilaui.com/userfiles/file/92033396818.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_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 17392 bytes
SHA-256: f348a108a69975a4283dbf48c165a7a9e807b262c149195c111eb85dd5a9b50a
font_01_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 10904 bytes
SHA-256: 685577811d879e43e18b0376fbec24ca14709be699155128acc9491f20c19aaf
font_02_sfnt_off00013197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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