Malicious PDF — malware analysis report

Static analysis result for SHA-256 93410b6f88ca10e7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 18:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68b4a4b071622278677a8406a747eb72 SHA-1: 88e1833522c24b3fc859fabe02bc30d4e57354e1 SHA-256: 93410b6f88ca10e73a23303894fd66f6b8aac72a7c1ead00e794415c817fc139
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the nature of the URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e3f91e346b8233049b426b218b734663/nilakekaxoxuze.pdf In PDF document text
    • http://koppeika.ru/userfiles/file/71586135537.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/41323098359.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/rakepot.pdfIn PDF document text
    • https://ibericadearmerias.com/file/nujubisaturosi.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/vubunirebupibeken.pdfIn PDF document text
    • http://clickvay.com/upload/files/45614115569.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/vanegugetorogokefikowoki.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425d6443021---38798227920.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/8st33s8lo2b69pqs70l8rnaetg/vebevexuzidizaxu.pdfIn PDF document text
    • https://noventa.cz/media/files/file/80425015401.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/pokiwawa.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/juzalemisexale.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/punugetefududufakopo.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/dovexodewodedomo.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/fizonujuwadi.pdfIn PDF document text
    • https://digicpictures.com/downloads/96524463260.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/78150651961.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/zanopobewezapuxozosemo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/uub46feeoklsd5gkm939qp2nb9/86215003786.pdfIn PDF document text
    • http://jawarakreasi.com/file/wipemaneboporobinerabob.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/50346623486.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/pegutaseran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+cite+pictures+in+text+apaPDF 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_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 17776 bytes
SHA-256: fbaf9b6a6ed5411aecb08c782d3973d6a86ca72c9bbd261a04ea435eba9e94e7
font_02_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 10600 bytes
SHA-256: b2172d88e67bc5b9998b83bee623e6d7660a6e10fa45d6fc2af63eec81ca97ee

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