Malicious PDF — malware analysis report

Static analysis result for SHA-256 524182df15d264c9…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 07:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9b349d10e4fba00a4b611d84db4bfc3 SHA-1: 15c5b9a9fced05126f4dbc167045036c65eff60f SHA-256: 524182df15d264c9e59d6279adeb2e586a03edfb195ddd0e564ba7b4da0c0705
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://laborke.ru/uplcv?utm_term=fancy+pants+steam PDF link annotation
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/8a7045a5c3a43199e580bcc221c966ab/bajozikatefalixudalupa.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/69149254580.pdfIn PDF document text
    • http://futboltotal.net/images/files/nafurozowovawarove.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/kuxeputotemem.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/tejigewozasukusoroduge.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/kulajitif.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3skmc13lojver9077of9bia3pj/38734972325.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6dfbf1fa0e5b09110afa29434bb1a438/32960752927.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/10899798095.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/webab.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161465f7086e12---77752252797.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/26019607096.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/9674373930.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/foditisikaxamo.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/54956175366.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/87123074899.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/26905139151.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8e8087991112f1d7268ed88e85a49968/10928558090.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/26996035264.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/15d355f18e46dff51062e1cb7b674111/wifemagigurivufovote.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/84qsqjlcs7950kqdagq12t9em1/wuxefefunebigom.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/9390228897.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161526d2e530bf.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/71414741569.pdfIn PDF document text
    • https://llc-sahara.com/site/files/tawenajid.pdfIn PDF document text
    • http://sdes.in/uploads/10395919204.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_off0000b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C1 10268 bytes
SHA-256: f9ea5da77ef199cc81472026834fe154c9b7c1b4192af9203b8bdb500697a062
font_01_sfnt_off0000cae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 15612 bytes
SHA-256: 8d8e64d59afb991b3a0090691243dda70a1263378cc165fc0e493e37851b15d6

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