Malicious PDF — malware analysis report

Static analysis result for SHA-256 120e1173521b8c7e…

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 19:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66a96ffa6610cef60345d78462a2d0f1 SHA-1: 31776accb455c1147402eb659343aaf13def73f7 SHA-256: 120e1173521b8c7e725ce991f9ebf97fb001d43230b5cc5730b1496d7c630b6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/gj594p3a0830lfb9qn6oj39eih/45872979136.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990f98b57ab---70888046365.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608297430df21---durazulufijexevekuponed.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/bifum.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vo9sktdkc2aj8m4cn6flphvuhs/35729210427.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/6836297723.pdfIn PDF document text
    • http://staropolski.net/Upload/file/bobaporafipepakodok.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/zuxim.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/kikepupoxixefi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//juvala.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/28307202066.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceaf30ee6a---xepetege.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/nirifuzabazisawuxevikir.pdfIn PDF document text
    • https://bachson.net/upload/file/sakabuzugibiravowakagugo.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/79863072171.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/xilaritejozanozilisinewu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609566dbbdadd---rowusidakakuxuwiguzuk.pdfIn PDF document text
    • https://ebooksweb.net/files/file/biwimobesegowobezeko.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/2613591268.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c90b09f34fa---75464644201.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf0c45ae6---22670249125.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/rinebonusorezuvawole.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74085599387.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef37a51b26---pozenuvowa.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/90005924625.pdfIn PDF document text
    • http://asvpp.fr/pdf/motobokulivikajukonev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tnpsc+group+2+model+question+paper+2018+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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 11676 bytes
SHA-256: 2323c68755f0d37c57f78e2d399d1afefde6a5e3adc39f6f003f79ad7226c880
font_01_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 23224 bytes
SHA-256: d52db6005781c4b20ea5386c129398f37203a2b2734a039845d472be16547634
font_02_sfnt_off00013898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1