Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc377635dc502223…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 09:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e15e37fe352f53172c9e27883caf3240 SHA-1: 239fd2e4c8dcc74e90a325007043375d1db29999 SHA-256: bc377635dc5022232030c40ef668d9f2cd24997a5d285d997db4fadb89cbd81f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://nomylo.ru/uplcv?utm_term=gardner+bender+gdt-3190+user+manual PDF link annotation
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/pqnaht3mmdnleeg28p6caslu57/17405018497.pdfIn PDF document text
    • http://tele-video.ru/upload/files/81468213386.pdfIn PDF document text
    • https://hse.tw/upload/file/waxitowisufe.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac8f99910---66434335307.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/jafefemaxa.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/voferofanuvuwosoguweben.pdfIn PDF document text
    • http://olympusflights.com/files/files/wagoral.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/491c02dbbd6e8bac1c2cc9e73cc91bd1/wokimudak.pdfIn PDF document text
    • https://roc.mn/uploads/files/doberepofapumutase.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0c4da1746f2297e19b74a99d9fd19ac2/nijekamotiruseragujeza.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/63245280166.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/87615615931.pdfIn PDF document text
    • http://machulski.com/public/file/gufofeterilatituro.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/rarurijugefiridudazabapu.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/63539975641.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072edbfcdf4a---febuliripetojifadam.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/74165010070.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/sizeferawagif.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/kibarudogurugapin.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc77acbed4---49731410497.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/pikusoxidisaborebab.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5a7f1b26ea09dc72ed2244523c7e28b5/kiridifosopera.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806ebc5b0c4---57667613897.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/82989699322.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/74656929932.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/72781951477.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_off0000ba99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA99 16340 bytes
SHA-256: 5042aa54217cf449e91e550fb0f6e451b672b810081099738d9472c42648ac05
font_01_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 11208 bytes
SHA-256: f80bfd390b3e85c3f5975c185d402ceb25f846bd89f5edad2aae5750b2709feb
font_02_sfnt_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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