Malicious PDF — malware analysis report

Static analysis result for SHA-256 d012114b34b1189c…

MALICIOUS

PDF

75.4 KB Created: 2021-07-02 04:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4021c26c7f4df0fe599e7d3c1288e20 SHA-1: 43111e4496350401ea1dd6f9412e5be70dca52b8 SHA-256: d012114b34b1189cee863b75a5ab5a0e5e80ac7dd4d45b71b7e211ea2a22f015
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links pointing to compromised WordPress sites, suggesting it's used for SEO manipulation or to lure users to malicious content. No scripts were extracted, but the presence of multiple compromised CMS upload links and a link farm pattern strongly suggests a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://krisoc.ru/uplcv?utm_term=online+style+guide
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97eb9ad710---namaxer.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609322182c9ff---58415424140.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/vs6pot7igq5590372a5rqkp656/65407846752.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/78vjrv41df4j1d3m56lg74uce2/nigapemamudipokedafuzixa.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3229906dc---32998120814.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/3ba78bbbf3af3bc7a4cdcad55584ac88/vepedijujiragelegoxiku.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/0768170018f4b4775da7b17dffc95905/22282842092.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3c62d8f3---9714345514.pdf
    • https://hgindustrial.eu/userfiles/files/81233785158.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6b03a562c06fff7d3e88f006c563746a/87928581817.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-19/20210519021314292719.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0702e4a87---68548973368.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7909a29095---bijuwafa.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/46033639719.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8ab9bc7d---filolejedusinijojadu.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/35de08bb45393e128053889645ede47e/niguxujanapasujar.pdf
    • https://contact-house.com/fckeditor/upload/file/tuzanutajusir.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa69fb6478---fepexexasubatodi.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43634a3f6---jorikunelaxudibofurimifu.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a94536e1b---55459268188.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6b47f6105d590ebbd08601f88711c27b/13918270091.pdf
    • http://stlnsk.ru/uploads/file/66507354115.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_off0000c74b.bin
e5a1e16f96f44dce1f331a4aa7274d4e622d341a84f3f3d4e2fe78f553d81db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 10280 bytes
font_01_sfnt_off0000de6e.bin
c3115b79ba801ab689388ae488c1065cfa00c912f56a4a13643ba7582452717a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 16288 bytes
font_02_sfnt_off000108a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 16792 bytes

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