Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6bbaed7dc30ed7…

MALICIOUS

PDF

92.4 KB Created: 2021-09-04 00:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa4fb226f054ed9c38a38dbbe79a8dc6 SHA-1: 40acc4ec597a18b81fab012831b124e07cfcc083 SHA-256: 3c6bbaed7dc30ed7c1af4716d52c758eadcd355ebf6ab3ad98c12d9dc1b4da19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007. The primary attack pattern is likely phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9925aed0bb---kovifuvipazob.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/756sq10d1onvoo99hgcn028im6/41899936925.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/37645170509.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b7be84cb6794ece504ea4f0cebc8c066/20233221955.pdfIn PDF document text
    • https://areicon.com/images/file/79424471586.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/34eb3a7a12d629ba666bb2848d0f1ea5/46188038227.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/kojedosovalemumob.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4359523bba---tagaxabe.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/gamaniwival.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/pezatuzorazemukuketamowa.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/30975934775.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/poxane.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/6397535928.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/59289368992.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/22085892069.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/bejikugoloj.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/89144389675.pdfIn PDF document text
    • http://risme.vn/files/jarigejezefuzapobojapewot.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/fuvezitemejusabubinu.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/28599196486.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3ce59bb640f0f17a38d3cbcadbfef92a/fikatagibobefixo.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/70260420439.pdfIn PDF document text
    • https://birudongker.com/contents//files/radarabedatewovawu.pdfIn PDF document text
    • http://vititanon.com/user_img/files/kekiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=world+cup+fixture+2018+russia+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 21296 bytes
SHA-256: c2219e4cb5517458211b7cd00384891e955729a2f635f81d1da4f69eae89378c
font_01_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 11204 bytes
SHA-256: 60f8cab414e23ac2eca42462a044ec53e3c6f9c1bf0c7aed21311836721e2335
font_03_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 16164 bytes
SHA-256: d7da5801168055627cb676c8436c5c866750233ea4b9482c0e601307330bf0b5
font_04_sfnt_off00014b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1