Malicious PDF — malware analysis report

Static analysis result for SHA-256 04034650cf2d797f…

MALICIOUS

PDF

86.2 KB Created: 2021-10-15 02:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6079304139f9f299618001f1909b0e45 SHA-1: 11f7ddf9d1c32716ffee3b8766cd53633e1c3318 SHA-256: 04034650cf2d797f553acf92c1da22de176446b231a4aaacc33164bf10ca65fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification. The embedded JavaScript likely serves to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dentalrud.com/userfiles/file/3198695212.pdf In PDF document text
    • http://feg.vn/uploads/files/matetivametajij.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/77941614941.pdfIn PDF document text
    • http://indexone.ru/upload/file/86976430792.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/31620630577.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/90334381580.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161334a8a52a1c---gonije.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/luwaguxidurisiwejunama.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161313c1301081---67301328526.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/vavezumimekakogedo.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/teloputenufajipekok.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/402685168e8e8361108bc79f907f84f1/71068855174.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/82342062013.pdfIn PDF document text
    • http://15441707.com/data/board/file/20211013224734.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/davinobi.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/80834577510.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16156eafde939b---32765955414.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/miburedivojolov.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/naxovux.pdfIn PDF document text
    • http://thuannam.com/image/files/36657526720.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210906024848.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wuvagatu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e3416ngjglmu604160pek330d7/70348178714.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=teloxy+engineering+case+study+answersPDF 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_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 10908 bytes
SHA-256: 6788d581704fcfbaa624e8f867acfc37ff91d424028e1b83657efe1366f8bab3
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 18272 bytes
SHA-256: f79c86c306f0709515345f8211816e86514ccca26bdbed282cc34cf6d7903a49

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