Malicious PDF — malware analysis report

Static analysis result for SHA-256 720c9f42fb45afe2…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 07:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7578a2613e1d36a8d6ce23b6c8f93492 SHA-1: 1c46903beb4f2490ddcef6fa8374355ecb325f48 SHA-256: 720c9f42fb45afe25014f7bfa43d5286acb2b6d4c9271ac28db53b9c961b0be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b09bc99270---20969084676.pdf
    • https://www.lipca.com/ckfinder/userfiles/files/midaxoxitasakajatowexugup.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161331d24f018e---nasobajegozazagebiwexi.pdf
    • http://mazdooradda.com/userfiles/file/64919000838.pdf
    • https://rajatotogroup1.com/contents/files/10572196416.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nmk40t3o29a4fofankcckrgq0h/mobodo.pdf
    • https://prestinieurope.com/userfiles/files/27933923918.pdf
    • http://aorganboys.handyfriendship.com/upload/files/biximabosujogiguwekij.pdf
    • http://aftp.bg/userfiles/file/83505193212.pdf
    • http://arucax.am/user_images/file/68951626131.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/87040316245.pdf
    • http://kibbkw.com/uploads/files/zefaxutesiwakifimiva.pdf
    • https://wronba.pl/uploads/wysiwyg/file/17456812139.pdf
    • http://lukasikgroup.pl/Image/files/goxukujodexalujew.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e514aac4f9---kodiziruxulebuvireto.pdf
    • https://samsungklima.net/upload/ckfinder/files/21100485809.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/86141822687.pdf
    • http://dezis.ru/uploads/files/79404337922.pdf
    • http://foto-preiss.at/upload_files/files/tinigifetiz.pdf
    • https://holcom-wd.holcom.vn/webroot/img/files/rakutamuvejukuro.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/50381566235.pdf
    • http://mariondhuique-mayer.com/data/file/87588814368.pdf
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74376506834.pdf
    • https://betenrealestate.com/sites/default/files/file/nolotu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=harry+potter+1+full+movie+in+tamil+download+tamilrockers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9D 16792 bytes
font_01_sfnt_off0000d5af.bin
c4ce76de4822c9eb10765b5658b9b566d8fb0f9181b435d5708dab4153543cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 17464 bytes
font_02_sfnt_off00010320.bin
1d51451c924b679d19b2fa1b6116d37728adc8b6e39d34eddf6cf5d39cc1768d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 11280 bytes