Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7cc3a7a91970c62…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 09:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4949acc33ff0660aff634c9364f3d9f SHA-1: e74f4c2504bd0d93d465e0827dc9c2a9cef393a6 SHA-256: d7cc3a7a91970c62987cbd246b20b931e60b10b76a424e3f00c1e762baab0c56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads or disposable domains, increasing the risk of phishing or malware delivery. No scripts were extracted, but the presence of numerous external URIs suggests the primary function is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/30121ec6ad5547f6f45d1b73f01a2226/rijokewegadewewenuwiw.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/67952166540.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116378ff0907---gufawuzetarokopegibamoz.pdf
    • https://nyirfa.hu/uploads/files/wobisijugexezufur.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43d7e8b2f---widadakefonuviwawe.pdf
    • http://appinaris.net/ckfinder/userfiles/publics/files/85787300273.pdf
    • http://hydrem.ru/images/file/41275019052.pdf
    • https://maisonforville.be/documents/file/78371264730.pdf
    • https://zabulgaria.org/userfiles/file/12981362534.pdf
    • http://www.ecvbrass.ch/user/web/file/96969924579.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/25f26bbd347ef5c317072a451998713f/19070720915.pdf
    • http://andlupa.com/userfiles/file/roxejetu.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081c629614b7---48408595951.pdf
    • http://www.aportecnica.com/imagenes/editor/file/56061684370.pdf
    • http://emurus.jp/userfiles/file/31373608230.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2e1c05a198ab137e223b20fbb7ce9455/tumivuvutozuzos.pdf
    • https://martabaktelor.com/contents//files/xezilofemareboremerigo.pdf
    • http://nmglyxx.com/userfiles/file/58597017139.pdf
    • http://anpo.vn/upload/files/81540268706.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b82e2a4a9---devuzijamelobafulixu.pdf
    • http://heureka-cz.eu/files/68095919530.pdf
    • http://ourconn.com/userfiles/file/202108291844449119.pdf
    • http://righetti-ticozzi.it/userfiles/files/57144861112.pdf
    • https://svingenieria.cl/userfiles/file/26417915272.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/47940466194.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=java+based+fire+alarm+system+project+pdf
    • 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_off0000c9eb.bin
82f4b61c1d9d4d24b0e9a95407d45d3604b84bc7ad47773666f50f33000d6657
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 17036 bytes
font_01_sfnt_off0000f60b.bin
019f6d39084a23f181828eb226cd46d853a1f9b13f745351d6791bc38ce5ac0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 11120 bytes
font_02_sfnt_off00010fd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 16792 bytes