Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4e8b64680f2ea0…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 06:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cf0388e0a270c6051a24862c0083889 SHA-1: 8e9d206b60804af5e778f6d58451098aa92bb6e6 SHA-256: 3e4e8b64680f2ea09620a8703db0408c4152336c2d9009029efdc213f989aea6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm pointing to various domains, including compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript and numerous external links indicates a high likelihood of malicious intent, possibly to download further payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=4k+movies+yify PDF link annotation
    • https://searchkar.com/ci/userfiles/files/33513424570.pdfIn PDF document text
    • http://koala-al.com/d/files/84543249633.pdfIn PDF document text
    • https://badoza.net/userfiles/file/85920740820.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6ce9601b96dd9b1eb565c79c31e64202/tixuri.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/ziwevan.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ccc25857a---xifazotiw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4p1ba0n3m1s5tasjhiqlicmh4h/wesuwinatajebawodizevaso.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/11961671439.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/042122359520.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/88301465645.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/23151765616.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/61080113639.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/46169302301.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/molezodiv.pdfIn PDF document text
    • http://jonme.net/ckupload/files/72891407475.pdfIn PDF document text
    • http://ombs.ru/uploads/files/lufugadi.pdfIn PDF document text
    • http://klhl.com/userfiles/file/kupunoji.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f56ae58be6---lemoferikebi.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/12805161108.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc949c126---gapogolitupasepalonagadu.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/feperojusovano.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/viwumexet.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/27805766617.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/64985616726.pdfIn PDF document text
    • 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_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 23692 bytes
SHA-256: 9829dd463488a30131f84683e5ae29b810ca31d5262314d204ccb12b6e19c3ac
font_01_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E2 10120 bytes
SHA-256: e9bacc85d9331ac5291c4ee28c11802f2283b84563182f75da82b99521caafac

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