Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6050a02416bc043…

MALICIOUS

PDF

70.8 KB Created: 2021-09-19 03:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 453d5dacb8bd037c8dfff54e8803ab87 SHA-1: 475686b3b1e031428c8515da6fa20618e939d8dc SHA-256: a6050a02416bc043797a39f8c7ec0e6a601da5ac0b81ca482d5f54ddd2a8761a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and 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 distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://teplospectr.ru/images/files/60216175202.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a1928a6f64a1fa8d31fffd94312ee27b/11493861982.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/93370645360.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/27231755997.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/77a795e9e9d3512b7506c12b37653189/desasibug.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/wuxudadopenepajanuzoxe.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/lizifalomajuwidaxifaze.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/16918559748.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321bec9b5e3---geguzibejififo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161385c28cd9bb---sifojagu.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/34060424216.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/73218994450.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/voxuwobedadomagavazusomaf.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/38641901153.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/81038731959.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/79049537980.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/46966902128.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/14e26a772cd4ba7275f91df77d4c3038/niduwupof.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133584a9cfb9---42189507537.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1d19e191c61eca7f6928d55e8dd392b8/8536695320.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/wadosaxutaja.pdfIn PDF document text
    • https://olterus.net/contents/files/17118199477.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/4866621303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dancing+road+mod+apkPDF 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_off0000b163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB163 10508 bytes
SHA-256: 925104f24a0c0132a4297395f4d80514b16a2bcb9357063f42d8050b18dfc692
font_01_sfnt_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 17924 bytes
SHA-256: 38becadacec5212e5f56397f6593e78f638d1e81b35f4fd73caa5b2990c406eb

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