Malicious PDF — malware analysis report

Static analysis result for SHA-256 688b8cc8133f8911…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 11:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10717e28855420202ff6840ea0f22ca4 SHA-1: adac706166a9ecb9cd6679702f0fd8d3146925bd SHA-256: 688b8cc8133f891106e30395506cf32e3416326aee9bc6f2df53e25bf4b12918
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm that redirects to various URLs, including one pointing to a raw IP address, suggesting an attempt to obscure the final destination. The presence of multiple links to potentially compromised CMS upload directories indicates a common tactic for distributing malicious files. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://rzn-house.ru/upload/file/99633305418.pdf In PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/lojidumamolijaxoke.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072866e51935---virisogofuwosemovatuxeb.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/62021228176.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/kelekozuxanaxezo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52b547300---nabekepupi.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/455b6b49ce09cf1a38d2bf553cd569ea/58575226182.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080292d40076---misem.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609855be36b8e---rekedix.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/fadinezusinarupepozowemor.pdfPDF link annotation
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3c2526c54214f3c57f1a762942f7ec28/2281457221.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/93239700649.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/konejidazorog.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/fibubitokozonoxiwi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac4be4bb7f---kawufogalazaxev.pdfIn PDF document text
    • https://bfull.ru/uploads/files/41094160145.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/53732472450.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/44026431434.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/21247964232.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5ed5ef2fd97f3d49a281f54ce8fd302c/kufikevefa.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/dewamadafijowosexerotowi.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/jorabosolo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c9657f6f---30199377588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=icssr+pdf+selection+listPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/19d4ad284cd78eee20ce71ee6b1514de/dinejexadafizasigimomowa.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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 17412 bytes
SHA-256: 2616939837f2b5d8b8f598d181540f847e7bbb3f1ce9464c68e566e614d04d5d
font_02_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 10400 bytes
SHA-256: 53e66baa801089bd4d27923d21f5c559c495c178c35d071a2a0b1570b7f3e0b0

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