Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b766fda7e23fcc…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 17:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d114ba0ed0fea4673174b74e7fe3825 SHA-1: 58c633a41b6e4c1eee5491f6770f96cc0141fb05 SHA-256: 74b766fda7e23fcce6e6bf0be063f1d87ee37dcbeb524977dddd0b5d5d79a696
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The link farm points to multiple domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the PDF, likely used as a spearphishing attachment (T1566.001).

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://terminarz.online/kosmetyczka/krakow/files/muwikorukivozobego.pdf In PDF document text
    • https://akapacha.com/userfiles/file/vesoxejugagofesuwojaleba.pdfIn PDF document text
    • https://slide-bearing.com/d/files/doxekiwapuk.pdfIn PDF document text
    • http://doxity.ro/ckfinder/userfiles/files/53590511130.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/81405641163.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///40967000306.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613664460fcf3---saxunusarek.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/nujapufagamoxu.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/digipawelemi.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/26917720873.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/18207870179.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30212264965.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/25382839777.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/sibuju.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/53735856280.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15fec8dd0---35011247295.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/43184068038.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/zagedumara.pdfIn PDF document text
    • http://willbramephotography.com/sigaxowojedu.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/51580045318.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9d561e1ccd58cc1aa6734dd1adb863b0/medogov.pdfIn PDF document text
    • https://motecx.com/images/file/lorudopoj.pdfIn PDF document text
    • http://www.bosingels.nl/ckfinder/userfiles/files/tekojisumavamakuwuj.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/faxobibutajozufagowuxusi.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/12166199512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cara+menghubungkan+android+ke+tv+tanpa+kabelPDF 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_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 16780 bytes
SHA-256: dc66be9c79daec5ad6389d456cb1de0a36954fd7fea1db31ad04af677bbed9bb
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 11100 bytes
SHA-256: 4bbf5e40781edc969b59d5c3f17e0e347e2895208c27f555bd9943962a367052
font_02_sfnt_off000124dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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