Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa4bb3e2cf60bf0…

MALICIOUS

PDF

82.2 KB Created: 2021-08-29 13:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c834e39a479f20b4759ca78b696e5e4 SHA-1: 1eb0120bae21c481967fbf8819460aa6973044bf SHA-256: bfa4bb3e2cf60bf0401ebd6e868d29476223272cbf8e37a6b0141045ba6abafd
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 CMS upload storage 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 embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=english+letter+writing+formal+and+informal PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160945d64da0c8---rifafevewofej.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c300c2c5ee8---63439323373.pdfIn PDF document text
    • https://ewt.cz/res/file/silidujowukimuri.pdfIn PDF document text
    • http://hotechike.com/files/files/37226506133.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/mogepumivejuxoluz.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/10877722980.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef883a74e7---belamixovawaxadowizukog.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e917985d28---mukepabekewakogopirovan.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160882bcacda90---femarirejivisuvuzujep.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/72754bebd33133c621721ac68a92b8b4/7903741070.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/gobemuralexifanosiwofuvo.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/725664462.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae8b85c28---gugulozepuguzeta.pdfIn PDF document text
    • https://ienter.bg/files/damufujazolezadejoruvuvu.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/28223942392.pdfIn PDF document text
    • http://blackshirts1961.com/clients/7/71/7137ee3fbd99c17d296746b31d66a47b/File/savomebalezifawirufeje.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/xiributaredaxebipu.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/31107028997.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/93536529640.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/95048253e9a35655b0d1fa0c015097e3/lapopuzolon.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/xivufopudesi.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/48274282982.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c39001598---71940384927.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42d199fa9---bigiresatejozibaj.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_off0000ddd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 17140 bytes
SHA-256: 34f9ba7011c8171ee583be8d470c1b375b0100aa2f7a38e529e6ed0f8f043e3a
font_01_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 10872 bytes
SHA-256: 0c8e7dbced818a2954774397590d3e316c83f365542be399f604a6b4b4ff5bc1
font_02_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1