Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d06508cc315d15…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 15:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4daba4ace5d7612b6f403756cd4764c SHA-1: 7a8d999f7627e2882116de8d42ba1197a848e173 SHA-256: 05d06508cc315d15ce030eceabbfbbfa86f1b1bf2449eb708ffd5b84c72c2884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/sijaneb.pdf In PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/80553614391.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16132efc0f3032---vejiwozafukasak.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/31602760223.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/palekogowi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1qn2r9do8hm605a40412t2c0oq/70544915860.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/81269274582.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/48e0b5af05b220d9585ebb9047915fad/28209239457.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/sakavimujasavetete.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/mufaxebufodirafetexan.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/80463524436.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/95391257561.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/norakitave.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/90972616364.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/7834813572.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3d1928e3---xanixuwunezadikonake.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/gikanegigupapumapoxo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8bvfi6cmg3olcl89uolc3gvlf2/10090349992.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/12e4108c9f88f5784c8118dd45365f58/wuxewafiseviresowepanu.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/lasetuvijurexilobagenes.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/kojomokotetopew.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/budonomogorudanom.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/nozuzasufalodogefune.pdfIn PDF document text
    • http://canadianrockies.info/files/file/dopaganofanepefonibaji.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/vulikexaxomomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dream+league+android+mod+1PDF link annotation
    • 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_off0000b4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A8 14592 bytes
SHA-256: 0cf1cce4f9ce61a6c0b8b5be9cbd1bf50412b3f29f523c63ee275ec1e0001ff0
font_01_sfnt_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 10476 bytes
SHA-256: 70c7964c574e731b92ce4bf16a05ff9346e7f0a4022b2b44a3839e296f6e5327
font_02_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1