Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86e1252a929cb99…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 11:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79049e064d96d7e6eae1fc31987ae044 SHA-1: 93a78443d260cf9fd58bceb34b34524d637d1aac SHA-256: f86e1252a929cb99abd938fe10473d4ae54678a9ba0f6411047060d30c62330a
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 hosting further PDF files. This indicates a link farm designed to obscure the final malicious destination, likely a phishing page or a malware downloader. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78cf8291d---12841649168.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v23oo6tsbs0op1ukv730557k64/jojalibijowotugubo.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2af6ebd8b04900095880239bad4e8a18/menuz.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e20fc0e2d---66821294499.pdf
    • http://kleinschaden.expert/userfiles/file/90195381684.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d82e37881f2---ziviriwi.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d9ca69d3ce7ae40c6a8e642bc9a5c2ac/likadaj.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a905e08a---55164398695.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5a2c6256---fifimepipukazabibudepate.pdf
    • https://dcoderesearch.com/uploads/rositosopajamem.pdf
    • http://hasici-pristroje-eshop.cz/files/file/mosudiwufipax.pdf
    • http://musclecar-taps.com/js/upload/files/ruvavujorifokavuwipeso.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/dd7207b6d630a79b41f635318c99ee6e/63805431121.pdf
    • http://maroba-zirndorf.de/file/bitukopaxanaj.pdf
    • http://turagent007.ru/userfiles/file/tezajijuso.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d64897bb---soloviwenaxebivubigito.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d078ae442b---17383501392.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5a11211a5---70190875735.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6dm97okf26r2vijls1ouad7h97/22211484830.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde881b759---86517100681.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb722b030---fowogapivasuvado.pdf
    • http://tunglamgarden.com/images/fck/file/bawumukal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=350+aud+to+usd
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e666.bin
c8baf0a40c7519a4e29da9c10220f29913a34f6bb4d591abd98e1203d57e47a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 10196 bytes
font_01_sfnt_off0000fd54.bin
6867be0af71a4edf525a2931e17e157c95a481c7fb9c0b875857d971572093d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 16864 bytes
font_02_sfnt_off0001294b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 16792 bytes