Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcc05cf054b319f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 08:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce5ebf05eec7969ab740bc159b52a658 SHA-1: f596103c2de694607a47da561e56d4334cefe587 SHA-256: 6bcc05cf054b319fadc03e3cde5d6a18784f8038c88d893058b49f209e2f7939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ClamAV detection and ML classifier also strongly indicate malicious intent. These links likely serve as a lure to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ip0ph86vji931gmm3mqfv76id1/52569546550.pdf In PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/92895056734df1b9666feda5b2729b1e/73647653740.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6f582cd4---65449659406.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/mopetefozevukudiziderazil.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/93078910536.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410813407ce---ruxabogurepujugatuxidup.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/34277910666.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/penuxuwokadavej.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/guxisazinadinegok.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/248723466.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210917093213.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/depomexunovowoku.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/wanaset.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210908_99E99CB27B764587.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/lubaxasugizuwatobapegelo.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/mefumi.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vimejerodutikuv.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210909113741.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908035705.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/38434125726.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/xagizovivamaguguzatuz.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/53557429457.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/fapifunozulonol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=appli+le+bon+coin+pour+androidPDF 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_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 19216 bytes
SHA-256: 2af1580d02119ba9adba71363c6eeb2214d618c696b58e9a59da479414a7be31
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 10460 bytes
SHA-256: 730225cce2810b736513fdfe8fa9bbc83a933ef465206653180726c7192aa248
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1