Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d8310713e5e871…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 07:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 87434ae2825d7722674c4eab5f4a9250 SHA-1: a181cc6b6bf4692c52ae958313f42304ac10fae9 SHA-256: 39d8310713e5e871700d34aa517b67e9a34bcd57d979e495466471e45a43b764
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of a 'Callback phishing phone lure' heuristic further indicates a social engineering attempt, likely to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=different+types+of+bar+graphs PDF link annotation
    • https://muratay.nl/userfiles/file/53463754128.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210923_185542.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210914152028413.pdfIn PDF document text
    • http://vswet.ru/f/nazalagaxiwajesisolis.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/76249444872.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/40774945228.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4d2a4eb18cf99834d6e7b425d45526d/34783516716.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/50237721571.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea0d160672---wepujavinudoxoduduki.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/70383689581.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/dikizomomakulovumeguv.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/3590712928.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/89510759576.pdfIn PDF document text
    • http://webs123.com/userfiles/file/linawujodubilofulekunuta.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/35472749658.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/19255716420.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5bb88af62f25df5286f8529288d0e013/99981036330.pdfIn PDF document text
    • http://mextro.de/upload/files/46959526630.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/bedonuniforaxipigesakeg.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/vopopotu.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910122118.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/woveneluzikosixusew.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2131a4999b221a2dbe9faefae2617c76/50559259285.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613615f0636f4---21777162970.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/fokulosevanawuzisamuso.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_off0000b20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20F 10844 bytes
SHA-256: 953f66cf944c93d7848ae86b50834fa18ceeb48e31c8b8e776567a696619f074
font_01_sfnt_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 16536 bytes
SHA-256: 9405563bcd92fc5d5900d120dfafb3a5b4f3e9c5ec07d4d56cde2eceb265ddd1
font_02_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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