Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33ff7cca149f74f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 08:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7513f6542e8c9a6eff131a391b40b61 SHA-1: 4669e56a1006996a6c87b67a93ec87856c31a009 SHA-256: b33ff7cca149f74f0586409c83e7921c4eeaf6c94538904eddfac9392bc896e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=melacak+keberadaan+hp+android+yang+hilang PDF link annotation
    • http://francescofesta.it/userfiles/files/wutevufejowevorelafebin.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/kikuxavixivivapuvekaresot.pdfIn PDF document text
    • http://dges.in/userfiles/file/32983420945.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/biras.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b6bdec819981a627615126c05dc925ff/gilege.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/jusasa.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/52460894820.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tanuvumokimevidagarevasef.pdfIn PDF document text
    • http://anninh247.info/upload/files/84701570046.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/67996334245.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/bojaxabulufoxule.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee8f46b673---94236476631.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f23833ccd---17281996433.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/56638268971.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/sororasejawilaledaduj.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c84f7c03f9---23680037406.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/gunona.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/zozosokox.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/duzufanusa.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/filuxosewawejelaroxi.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/senabimiratawaf.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9da2473e---75090144763.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/nirirodexusuv.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/duliponavefimiza.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e963fb14186af0a37e01a860187c1a05/3258497897.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c1a13e34894f6346f548e1cd77df2414/46802224440.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/90618248657.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/watagosanaligav.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_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 16140 bytes
SHA-256: 85140d407b1ff900843c9b34ade140dd6668a28f8e0ce1b60b66a84c6716fc49
font_01_sfnt_off00010e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268F 10868 bytes
SHA-256: 9a94340125ff22a3362ee940bb0a91a5522fe7b2789b229da7bb6d4d1222c0ca