Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13d048b5dc8c4dd…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 11:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c009acef7f0fd6f2b62f791b3c8ebcaa SHA-1: 6618f56f7ff3b6902b2a29036fee461abf861c4a SHA-256: f13d048b5dc8c4ddfec25918b5f90fb916322357917fea1e550f7d04f5be20b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to domains that appear to be compromised or used for hosting malicious files, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kolasinprevoz.rs/slike/files/zetobejux.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980407c8487---vifuruxizupedalonaja.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vuf2g8rtdpnvb02t3d8b96srs2/96823482728.pdf
    • https://zoorichi.com/temp/fckeditor/file/96557314874.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d289876bc43---81196507984.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/55436727591.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b93622526ed---gisofigururo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b67c29d2---48864189519.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843309ee716---lojiwujopu.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd5b6078d---kanemotalobonug.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4823038af335738a01c358e99a0de89c/79408554966.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/eoh3m08jrqd94imn0mq4donkdp/radiwabesitakowom.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tsui4mrnc934ij91ju5hq3lggn/38316164423.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea474df911---kulepifopilo.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2c9120dc---ratazox.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608640c8e252a---rexifudosekubimajovi.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/944a1bc3d9ab594cf767fc596f80951e/xelefamezuroxavaduteka.pdf
    • http://amctop.com/board_data/editor_img/file/202105100334.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/fofiwozufobovifi.pdf
    • https://xosobacninh.vn/webroot/img/files/tumuvobe.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0a4da66c2---87717797682.pdf
    • https://tonitomov.com/picture/file/rorazodenisajelafubigon.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c581e7f96---79768762868.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160897a50a8538---zodidozolusexijigofilo.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/vatisipimixes.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=grasshoppers+and+locusts
    • 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_off0000fb58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 16792 bytes
font_01_sfnt_off0001136a.bin
6789404d57f3fb3b7e8ca8fd86482b2af929f1fd062ebf129acd044901441e4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 16748 bytes
font_02_sfnt_off00013ee2.bin
c4e10cddf706d31206df50ff9119a45aa0633328c279bb71f1bd50a8cbb55d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE2 10660 bytes

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