Malicious PDF — malware analysis report

Static analysis result for SHA-256 5067719f5023ac4e…

MALICIOUS

PDF

68.9 KB Created: 2021-07-10 05:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ae98529df14fcc5247426f9a2bec3f77 SHA-1: cd54782fa15d554d284d3c442f1e206a8afc5e4b SHA-256: 5067719f5023ac4e018319ea9f508b9e7230e775702af9bba9ca84a96b45079f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, many of which are hosted on disposable domains or utilize link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=cft+to+gallon PDF link annotation
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098afbdeaaa2---38367669281.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/dosuvunuzozotupuweraxexin.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c84f2f0e---fumanisatun.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2147014a---34164711937.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/12894616363.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9fc638b02dcef9e00b304c68b4deb094/82654971615.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ef4a15180c2e6487d834b5aa3174ad3c/47783849731.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/dolimekinojabev.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094d13d833b8---notiz.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b85957fe---44559748881.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/62034843510.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/goponunakut.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6ad31caaea0c113000516a5618bbd19b/patupufanerawajano.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/tapirelidefimiwaf.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e1b6e07de304b1ab9710492cf5ff2848/baxinaleriwizowexeb.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ea98a23a---89674641433.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608499dcd3494---rezivubidijugig.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/saxizikuw.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/999b15821bb4b58ec11b33597851831c/jiduvoxapekot.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc256ec2da---talekumoxedekavumekazuja.pdfIn PDF document text
    • http://cy2hand.com/userfiles/63482815328.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/doxupokupiborabezak.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/xoworabigamawub.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/3869352655.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_off0000b329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 14812 bytes
SHA-256: 0d8780d6aab26bf8c75694291a5876183bfb6209de1bd2c08834913c41967a92
font_01_sfnt_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 9928 bytes
SHA-256: 5e9f1254ac9ca005e26af335de7cf5d61f199fd8fad992c76ccee6b13a8ed176
font_02_sfnt_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1