Malicious PDF — malware analysis report

Static analysis result for SHA-256 741c9523ba950431…

MALICIOUS

PDF

93.3 KB Created: 2021-09-07 06:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5255e430dac9d0f200a0eb94bd124118 SHA-1: 856f4185f2511a0c304ea16f1177bd076795b603 SHA-256: 741c9523ba950431e0a04c6a2f7a6defc0ffdb8dc79a65c9eb24e2347172723e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of numerous external links, many hosted on potentially compromised CMS uploads, is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b2619235b32a29202c4c5e501b3b39a1/50055866768.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d3118120ec7---davilisapuguxikivofi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cf16914b1f4---jakasigilugekulu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12480d794---gevudimobalawil.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8744ae0ae---30989175049.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/38104462909.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107cfbc553da---jikus.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/28aec8fbad0c7cccdb8891abf03cbc3e/41217222630.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/95273352899.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/asgs2ks6es032u62cm1ppdv0ed/4910509002.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/1grsi2hr8q4d6cdvrosqkmoopf/jojusara.pdfIn PDF document text
    • https://mmszke.hu/files/file/82365377416.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8q229sjd3ul19s46f1jgbj4suj/18054402157.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/dawedidilunogesuxebewabob.pdfIn PDF document text
    • http://riceart.ir/basefile/files/mabokobamimelekisalagilo.pdfIn PDF document text
    • http://24cvety.ru/upload/files/kepomewonawutisufizipitu.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/82232875583.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/70829668386.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/wonalemub.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b29428b630f---33457155317.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84a443532---85878482422.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/21679561160.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/5938152458.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f5fc2b651---42590749215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=voulez+vous+abba+sheet+music+pdfPDF 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_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 11016 bytes
SHA-256: 19fe1273c7958e0e648f85281642fd00ba0aa781790e3ad43ee1e4129bf2ab2b
font_01_sfnt_off00011a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 19940 bytes
SHA-256: b27476fabc335f65f0ab1cc237be8fd9ebeef8d5e2d6583ca2c611b9c15e36de
font_02_sfnt_off00014f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1