Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e607960f77bc9f3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 01:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ac6e399c92c5995641782438284931b SHA-1: 81c3bb9cbec73b7247cf06b0cccd51ca331f2ecd SHA-256: 3e607960f77bc9f3ed234e224ad0b2b4b3cfd1369df7198278549af2e2a37989
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites. The heuristic firings indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=the+flame+and+the+flower+read+online+free PDF link annotation
    • http://przychodnia-felinskiego.pl/uploads/editor/file/dasumixe.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/51080507984.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/72368717456.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161323e6f80ab3---11155911171.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/goragasurasubojiredira.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/54355342040.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebabaa8ca5---28828887490.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8408b614043becb1bfba742634f88a95/24428090796.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161413f57d6966---8771846156.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/51720631500.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e6ef1e247e3bd2a2eb189053dfdf637f/72098305613.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/49486096271.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/12suvbnvp5bidhh9tfeq411e54/36770059837.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/sujowapekolagafeto.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/72153180152.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e035ffe2---wawuvazusoses.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/ronoragowonexejabi.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/17995201603.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/venuxufa.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/49484871301.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/11062431369.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/87c72a6afdf051ad6f912b2cda6808b8/89317716717.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/81643350809.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/52617030106.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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 17356 bytes
SHA-256: 6978be4818316c254c7d5157c777dae7e9163effee99807eb8ee5aacb4bb73a4
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 10500 bytes
SHA-256: bffcf43d49a10946d2fd7ebfaed960df6339f52d463c721fa8e1b3ab2cc5d88c
font_02_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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