Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbc07c281ba0f32…

MALICIOUS

PDF

88.7 KB Created: 2021-09-20 08:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1637473fcaf80c108cc3091793f0333 SHA-1: ba4a2fd698e475b9e947d6d765d247d800aec5f5 SHA-256: 5cbc07c281ba0f32228e4baf244497b79e75d9f4af9f37348aba26a52397a1bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://pistant.ru/uplcv?utm_term=physics+equation+sheet+higher PDF link annotation
    • http://wohingltd.com/userfiles/45163745929.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/21862681955.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/nesorodokonesetijufa.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/79706457246.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cca5d45c67---zaburorotejelavalulu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16147d1bf3ca69---60865724916.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/68728398682.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/lotelukoz.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/40728334951.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/negalopawowosoruruja.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nojaxizobowixukopesiteti.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/4124063720.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/27538375596.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4df56ca6662590620fc1d2bbab321f8c/13978225846.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/67316208306.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136538aeb181---ravikesi.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/23196189329.pdfIn PDF document text
    • https://2winit.com/Files/files/poxuzeweb.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/zixewa.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/51975249155.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/zadigaxu.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/91072706763.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/35564083066.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/jokabaguvajexed.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/wanudajinidofif.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387373ebfab---pelaropiwivowed.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/pumojeka.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_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 18360 bytes
SHA-256: 3665209b3846bb0f0a8a7d46dc57b10c65ee394e6bf7eefbeee4e60feb9775c4
font_01_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 10824 bytes
SHA-256: 4ae7b46213fca0871d5f25eb1cbd3a5e625f4eaf1b5f677139a0eb6b2b2dbc28
font_02_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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