Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e4970aee3a2377…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 22:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2e1a7d3dbe045f6523ee57c426495d6 SHA-1: 14d435445ee525eed8040b26eeaa37ec56a3eaaa SHA-256: b3e4970aee3a2377ec2f943f0d8af541e0a71cfcf657714e3ddbc24f6535645f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ffbd9884---76591535150.pdf In PDF document text
    • http://saiprogetti.net/userfiles/files/58605389671.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/54823827186.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/6176356346.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/wilom.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/88532028504.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ea3f1e5ccf53195df148fa3b74203a2b/43392383821.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/bokijezosavetiwinuvo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ba745774d98fd9e1676ffcee54830972/roxufufepilul.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/luwowokibuxejowuwunux.pdfIn PDF document text
    • https://insp.biz/img/file/musozeti.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/duxekijugajazawik.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/jogadesovawigetun.pdfIn PDF document text
    • http://mutitar.com/user_img/files/84011007906.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dixanefenux.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b7af4fda3fba5fcbf95f8de8c866b0c2/dujapozifuzeguxemexawu.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/rakojisuxalilowa.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/xukupebuferutanajipujo.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/51068783299.pdfIn PDF document text
    • http://labotinnghia.com/img/files/66982439562.pdfIn PDF document text
    • http://domosplast.hu/files/file/dobufebuzule.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/lakutanizakaseja.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8eddfd71ae530400b65941cf807139fc/57474993381.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/76995361436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tale+of+love+movie+onlinePDF 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_off0000bc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC42 17040 bytes
SHA-256: a1410b742c0da971596d9322aa3d0b012da93a09f1d3099bcf6bfbf11319ab60
font_01_sfnt_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 10040 bytes
SHA-256: d01c6e807c86d4f3882636bfb48dfa85713cbb57d4302e66ac53b104e50f39f1