Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91a55b92f35ca8d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 12:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd47ae64d8d82c181a550cdd1f5a3638 SHA-1: b50c221154e17e7e7ce90950eaabc256c684f064 SHA-256: f91a55b92f35ca8dbf3973960e9f68e8b0d92749d58e407c13b4f3ac6dd82d17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The file also includes numerous external URIs pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of JavaScript and the nature of the linked URLs indicate an attempt to execute malicious code or trick the user into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=reliability+engineer+resume+pdf PDF link annotation
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a336489b3b7---80061601832.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/jewumabuterilirul.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8f4d5cc29---bavomijisakekov.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/41146738668.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb18eb69d4c---36992409269.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16072f90794b12---55176545991.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/27397032917.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/jedofikiponopavulizox.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ecff7de97dc---vaminof.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/gcbik6oh4b50o2im26o76stvk7/tetidikesonu.pdfIn PDF document text
    • http://imbirimbir.ru/files/jenaziloxidivutule.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1c7bd30b---48822930291.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e112c945a---67134800868.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085352d02015---degikulum.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17f04e8e9---sulufezokotekipanewo.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/45187709131.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/025tkurd14pu68qckqj2te1d5i/gaxagodewugajapag.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wanotedewov.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/jufosajibuwi.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/5fdffcc028e7378c825f0df8d3e98de8/pubudokowu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/damakirewetodopebefolesir.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nubegamebukekefeboxaxenu.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/dodaluviredikufegasi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dsiu6oponblng282mcjkmea327/13314635382.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_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 17396 bytes
SHA-256: 47024caa54f59919ee58b87e40beaa488523f207c5f915ff2ff3be10bfa8d10d
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 11120 bytes
SHA-256: 5a157790caa29719f9cbcc7e694e0f525434ded4b9b36643ce362baf27863626

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