Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da1bf59bd127fad…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 09:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd7f9296cee6d113602f7bd41560faeb SHA-1: 92820722cd612febfc4a5867fe543fb8e2f0aef2 SHA-256: 2da1bf59bd127fad9ffe6e2f2054064c7713773dc84ee58143c41f208c02e848
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple URLs, some of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://buyyoutubesubscribers.com/ci/userfiles/files/lanubulumedobidaretuga.pdf In PDF document text
    • http://creatinglifeoptions.com/userfiles/files/todekuresol.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f4e592e893dbfb88efe6e507dde46294/jopuj.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/domapevebuxozunox.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/wufiviji.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/tonipulelel.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210910165732.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/wevuluzinasaguroxogo.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/82335826315.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/89988403007.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613890ba2c56e---30451903618.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/8437853572.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/zilugamezedonakobew.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/simekudavirekokebabu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/dc96d3e11504e9dcb253e15b5379652f/narotenemobewegi.pdfIn PDF document text
    • http://rivucota.com/upload/files/fisejuz.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/65594892283.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210912_202316.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jigiliragowexanekajuvikuw.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zupuremis.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/lufokipowapipufit.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/54413258418.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/rewixirojuvufagopuseto.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/77567535612.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/vadebotunesajudinovojawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+move+game+apps+to+sd+cardPDF 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_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 10760 bytes
SHA-256: 39818d5be72348269b44d8ce2dd1bac65c5f96e218fc179ae4af768a5a73fd9a
font_01_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 17804 bytes
SHA-256: aab6f2ed167c3d42da2dc5a974f5f9a5b4143dcfdc177efc65b7d70686dd689a
font_02_sfnt_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1