Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbd287f16c8a8e6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 00:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c5b6a5734ce2eb2c43cbf236bb384e6 SHA-1: 3a98d5e7639e681b223eb16fc8090a1287804413 SHA-256: bfbd287f16c8a8e6cb85b059f919f8bfe193d07b107d5fc88991db6ed9833f0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ajitcoatings.com/uploads/zikunixefuw.pdf In PDF document text
    • https://nepalonetours.com/userfiles/files/406851432.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0p03e2rkj70ehclrp44h30mj84/bisopimox.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/42604054177.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/buzewuzamikedadovoxewu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7e1153b9412fe312f93e77373ec5605e/76855232361.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/oargu54qa6sc75e9cg4u3dv1q1/85681137951.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/78291198698.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/dabezejuxafov.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7f0d70d8b8a7ac516bdec1e26d5180d9/9247570727.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec87f7c013---dumagufawusifu.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210708115337.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/h46nfk99ff87359tefh9oqamfg/10170182738.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/sirefap.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1994b99e64---63000229683.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612626b25d9c8---71915407085.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/p74u1l14nam03sc3hvccro38r1/degolapazumuleso.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/rugebemu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/39gfc19e4a5t31v9nfm8tornd6/jurirolosiwarinimi.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/pejufegibuwasinilonadufes.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/kajurisizomolenet.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/47675424269.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/db8cbcca808f8ccab49eb306edd148db/13266164189.pdfIn PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/xuvojupodug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=reading+comprehension+worksheets+1st+grade+multiple+choicePDF 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_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 16700 bytes
SHA-256: 99557ab6ec1c55c2e9369f0d2898e97e202be5709c8bdc0e882a1620bdc182f9
font_02_sfnt_off00012081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 11336 bytes
SHA-256: ef5b55f0e280299693c249d55133aed8dc27aa555e0749eeac523988f6d34303

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