Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba7238343d8079b…

MALICIOUS

PDF

79.1 KB Created: 2021-07-15 13:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a476f4266fd71084102042c831c7559b SHA-1: 8324dc91c38ce9f80ba6015276ae86627250dcf1 SHA-256: 4ba7238343d8079bb0f5e7d080d10ef11333935dc099eedb23e591b501e5a53f
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm used for SEO manipulation or phishing. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's purpose is to trick users into paying fees for a non-existent prize or parcel delivery. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://zxsolar.com/d/files/malinuxoritakuwivezu.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b9b0fd161aea7bc52f77b74ce119add7/18448123265.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085d63bb253d---73309286718.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f0aff63e2e3201bf755314bbc9e60dad/setevaxurapagosute.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/naxemotevazenomegek.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/72461918931.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/72620eae7e81b47493a1d0820c44de53/fitamijitalinowejuvoral.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/20807205489.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/36354600220.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/70364995791.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/sasisujakenabotoret.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/6871818227.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7vbetsqkde5mr0vabk5adpr57v/bufaxididanatunipuj.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/79787922287.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/tidepexegibitegib.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/tixafivupinibo.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/49f3dbe9d26dfeb6c4700a3b85a73d8a/xobijizivarumew.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0181af22---49699806815.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/59933448250.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607200d73fafe---44975308754.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/dapenix.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6cc38a9c62cd1a05557c9da08da86720/8404728209.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/xaradasot.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/80828925621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=curtains+and+sheers+pricesPDF 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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 15956 bytes
SHA-256: 637f379495c18c6ce60b5f1c3749e8f54ed25e0c5b2f48df5e5a4b5655b37254
font_02_sfnt_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 10576 bytes
SHA-256: 4dc074c691b2fa3b4409aa662cf8db829df8c0b3d1c63b9a9133cf57585cdd85

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