Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb65b20aedb1c3d5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 10:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b006de255eaa6d6841ea91da6bb5a68 SHA-1: 5ed6b36412e1fe1855adc9b642adef9e198a49c2 SHA-256: bb65b20aedb1c3d5f4e3cb833525eaed83c45697ab160d3be9c70040fd5f9922
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://goldnumber.info/userfiles/file/nubizabulawavik.pdf In PDF document text
    • http://cableesmaltado.com/d/files/jipapezipugadem.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/bidokas.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/fitowazelojadavajofowo.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/sokakuvizokekegogar.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/40536494771.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/40671618967.pdfIn PDF document text
    • https://afayl.com/userfiles/file/78625265022.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/vatuviwa.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/vurafovimedikedat.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/senokevidava.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/37544442718.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/vifanapoka.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bad4ddad2af---jebenewuralogup.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbecf7636fd---basebokurulukusatopotun.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/39050809586.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a114c237c76---25229751039.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d9b899886248d18096cdab8d5e0cbb66/negimi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26d454a72---ratimox.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6baee457c---61442780994.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/72716064885.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210812_96E46DDE2B87659A.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/xukejutolulukalepe.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210619141221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=james+joyce+araby+short+story+pdfPDF 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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 16712 bytes
SHA-256: f2343ca8b64258fc02ab53b170d65d2276bff29eb59c789a8d79006f4fac3209
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 11020 bytes
SHA-256: bcf52515a22ae5a140cd1d69dafa04cf72be84c9bcff77f8c811eb76e41f0d3a
font_02_sfnt_off000121d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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