Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42a8a2a003747bc…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 21:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f3b0a76807b1c73bffce40575078311 SHA-1: 4a0f039bcb0b48e4d00e442039545661e1c5440f SHA-256: b42a8a2a003747bc7d1d2e19ad5449db8321880b063d102ed02e68c5520074b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=iowa+core+manual+commercial+applicators+license+practice+test PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a1950ccba5bc08e91f545ce3f333ce54/jukoxivupujor.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/76477445138.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/buvul.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8d26a2847a83deb5ef8ed30fbc527268/5370594630.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f673c00f00---45849047123.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9b01e6d5d73ec9a999e8f863187ae451/lorawevexi.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/badorikoninimesuvikifidu.pdfIn PDF document text
    • http://ciskmv.com/css/file/keziburojanofu.pdfIn PDF document text
    • http://c-amc.com/upload/files/51257516427.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160863b494eb37---veriror.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210719073802.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072060414cf2---koxorivepunotuxufug.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ce16856a---58446035106.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/55503505235.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610101d8c5c63---tegolexaditere.pdfIn PDF document text
    • https://susta.vn/userfiles/file/dodoronebogowu.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/59006222740.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/41863162363.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o87rrm60bc52g4s5jm44ppr4pi/56388325879.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608463306fc75---39838671217.pdfIn PDF document text
    • http://mextro.de/upload/files/pimamujom.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/22406006900.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_off0000bfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA2 17272 bytes
SHA-256: 7fde50e1759c2bb23eae146e38a4ac90f53b923f1adaac523d347782700ac2c4
font_01_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 10672 bytes
SHA-256: 7655085e6ac72612e4292c67d3a986f2996b76d56ae51cc8e57835212dcf6a2b
font_02_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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