Malicious PDF — malware analysis report

Static analysis result for SHA-256 24874cb8fb016363…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 23:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14cfb901cf6eb278c165a0c2efd40e0a SHA-1: 2ae3916e56af14517dd6501f88c718cec1aba8f7 SHA-256: 24874cb8fb01636397c2a7bbb710f6a69a954b182d23e306ced46a4cfa50fac2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The PDF also hosts a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c905f081dec---wulizikorisobaw.pdf In PDF document text
    • http://vladjurnalist.ru/archive/file/95278860122.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635b436f8f---davegepilitime.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b67379fe0---25198953112.pdfIn PDF document text
    • http://anpo.vn/upload/files/varitajefubo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4j9veht8uiucqvffidfns3cl4u/nekijuradudalaxuki.pdfIn PDF document text
    • http://halmar.info/userfiles/file/75532118283.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/pususo.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/gurup.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/74586143826.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/fodinemijodejogif.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/77510805304.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/35427532255.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c58c53ced---gukowitopevoxoseg.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/kewizetuf.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/pupegib.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/sopabazixasamaj.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fa2c90761---zepesojag.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161211679df644---bepujozesoromezituduv.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/mekiwejubiwa.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16100cae53f83e---6582467201.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3330e84f37---fafusikenunizi.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/bilamipigikaw.pdfIn PDF document text
    • http://adveotec.com/img/file/valegafu.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/xegexobejobujaxegesos.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210704111745147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kinds+of+triangles+worksheets+grade+4PDF 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_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 18084 bytes
SHA-256: 162edf2f720a2ef5b3ab6336926da734468aec8f337a2c28b4d63de2975aa139
font_02_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 10880 bytes
SHA-256: 24f8b11f66a5f77443e0da9ae1520e6b3f88fcc58f7c61f711450a95312d138b

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