Malicious PDF — malware analysis report

Static analysis result for SHA-256 4737847981594f64…

MALICIOUS

PDF

95.9 KB Created: 2021-07-21 20:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 89906a94238b48ea5608e12529a54577 SHA-1: 9dd72f79a979fb745f25933b89470ee75633a700 SHA-256: 4737847981594f6483dff1efa48d9e3d08ab563d03bc597b59c7169d0fd4382c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites. Heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://consade.com/userfiles/file/domopepet.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/igimuwigedabowuselam.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ca386122fde46677b06af94cf78066bd/46861135134.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b842022c13b67a509b3bb9bc7f86bfe6/giwuze.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/51a7516cb0974b9b7150e6eb00a96d57/miwomuf.pdfIn PDF document text
    • http://biomisszio.hu/tmp/65894263999.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b2e92854---8622172167.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/46579010059.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050709235618.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc587c8653---26070324640.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/gulewigitufojazexegetu.pdfIn PDF document text
    • http://adveotec.com/img/file/pitirebifekuridowex.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cff33808e8a3a83ac07e7873ddf6d659/8990992823.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/pudujavutapur.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/mitelasagimajufabigezix.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/3526698358.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/8960343226.pdfIn PDF document text
    • http://farmina.ru/uploads/files/7543609292.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f45921eb6e5---febibalubaparur.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c109ca61cf70de365d75c2c1df9b5ad7/54235771643.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/sivazotinoganawi.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e8cc0d7f---xixetuxugis.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/wowefejimepemuret.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/51231491427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=indigo+extra+questions+and+answersPDF 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_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 10760 bytes
SHA-256: 311339d87eae1930f9628a3c9cec72c7b24dce10f1d0d7719f026643c9ce769a
font_02_sfnt_off00014505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14505 17260 bytes
SHA-256: e4a6250da60e52fe3100ee6f74b2a13c13430b78ccd70f6694bf4c52060e8fb4