Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8f41789a9a5615…

MALICIOUS

PDF

78.6 KB Created: 2021-08-27 01:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cf4aca8e66db6f7cfde10d824862b32 SHA-1: 020aa792e43cc844e3299132b3d59dcb83e8c50b SHA-256: db8f41789a9a56159e9690c6cb83e38d67763bfc8aacca3106dfaa2349f6ce0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports its role as a malicious document, potentially used in a spearphishing campaign (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3047723e158f8a15e47b802d536ffe7d/72965162712.pdf In PDF document text
    • http://fashioneducation.ru/userfiles/file/nasesavewinepidu.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/aeeb9e9bb5f2442c013f02b0b62cf466/46233838292.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081da021f960---75958738400.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/nedexejubuzedasorope.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/30593646736.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161190603ce018---89951118813.pdfIn PDF document text
    • http://zuche0551.com/upload/file/47663052392.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7abc9192fe---pakigukatekixakiko.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810e8e21bd4---7497109246.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/mofolupivuma.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021718164538877.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/jupopufob.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9183700b33cb6b363bd91c0007d388bc/mamewobadeful.pdfIn PDF document text
    • https://phnews.ro/files/file/mufusobolukimiwiteba.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/gopizagune.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984bc820ef7---83911260661.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ee5917f5f8b0ee327c8a5f3ffebd7d27/jivuge.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/pokusosexaba.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/7c19a2cc822059eccb2660c208a5eeed/94063325126.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869203bc816---42787237191.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/43d5ee02ff53695aa935902bc64abcb2/nujitevosul.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2976dc8cfa19509429e39adc2e6b53ff/delazisija.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/55330201379.pdfIn PDF document text
    • http://poorclarescork.ie/images/gititesavurologusox.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/10591755749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=emf+equation+of+a+single+phase+transformerPDF 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_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 11032 bytes
SHA-256: d758d0eb6893065af8baad36f77ece9efa6671df994c842f7ec148ceeec16db1
font_01_sfnt_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 16784 bytes
SHA-256: 04f80915aeaf53a28ca0299030971ca0a1e489f9cee7c57eeccdd566b2356f1f
font_02_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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