Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a5bdeca79c0bec…

MALICIOUS

PDF

97.0 KB Created: 2021-07-25 05:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b5324ee7ced4df6050a849cb889166bd SHA-1: 72c6933d7668a58980b7b21f14e11c3cb19a326d SHA-256: f3a5bdeca79c0bec6f322c9608aa160eac12e17d822f7b671cf45d98a8be37f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. Many of these URLs point to compromised CMS upload directories, suggesting a tactic to host malicious content or phishing pages. The PDF itself appears to be a link farm designed to direct users to these potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a12aa90537fe5609b11f95e7cf84366f/fovisugovafiwamofoxijomis.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/af2886b57a5c63e2c44f856349643027/89214495378.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/33499163340.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/60805029184.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9b76c695490bcb09b2e504b9f3ef9220/lapozowetemikaliporoz.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f408bc968f1---60014712369.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/4391849724.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9ff068a8e5b88a309a468418fdc1028/46032983461.pdfIn PDF document text
    • http://masonhn.com/d/files/53986158249.pdfIn PDF document text
    • http://chapelguild.com/images/usr/tebewalijegar.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/tusufemedajeduzijodumo.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/fufolupenifapiserukapat.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079880e18406---tusinejux.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/0419287a32e955f21af56ed6726111ec/vilafirijegalo.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/tegokudugawebifama.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2aa8e45c49---renivisapulokul.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/nojuwesezutanatisodonem.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1c651f15d34ae3f2e8a851dddb9964bb/47235590042.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/v3g6dbur1t2pmm0tojirld98fc/sitadug.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/682ec0703937eabb2d7d49268ffbff5b/45436245173.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f64dde2a070ba14b065217710611f79c/60563899277.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/paxuje.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f694009d3bb30aef064db2e11caf8211/zekasonobetinovexujugum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=natural+remedies+encyclopedia+7th+edition+pdf+downloadPDF 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_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 11212 bytes
SHA-256: 6243cc4e335af352d4027bbb6416523996b7acbc4ad0975aa0ac8f11e136ba52
font_01_sfnt_off00012eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C9 17904 bytes
SHA-256: 8511142d73828c562cf80ac2daf96e36069dd016ebf79670197c12ab146b59da

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