Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc043f3ea38210ce…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 06:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d962bd3addf9242dbd3534b667d7450 SHA-1: cb4d101969f4a49eab9379fa6cf7df84fae97a2a SHA-256: dc043f3ea38210ced9a1b93464386f07cd87075d2e0019acf39ef6ff21f66394
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm, with many URLs pointing to files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or distribute further malware. The presence of numerous links on disposable or compromised hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c39d942f---xawimewim.pdf
    • https://living-stone.lu/userfiles/files/7024951320.pdf
    • http://seoulmenu.com/uploads/files/kulovoterumiza.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31826f4095---kasegubizu.pdf
    • http://rogo-rotterdam.nl/files/xawosagababilonelumala.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab7749492---85884504671.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9b7efe6ef3fdb153090838865e1f92e1/radisasujo.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160799cc879faa---mowunatewarefuwadopiz.pdf
    • http://5m-tti.com/uploads/image/files/84806988688.pdf
    • http://gomientrung.vn/uploads/image/files/81469619422.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ebd0094e3ba7ce523a877c8a44da4358/rabisutolusirol.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b90cdee7---18932156624.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759cb02f5b0---xamokidojo.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d0c7a5d---vuxibux.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/zumoxedijarizum.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/mf20c1drgge5lbttv73uqkego5/19634344485.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7e26e0f69020f0dc7a0e7112fe90af09/78617567749.pdf
    • https://cplastik.cz/data/cms/file/10245848120.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c988bddd59d24e1249d11aa8de7cdb4e/48242224600.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8810950e5afa598ea3db178cfe465c33/21898041289.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/rivukezezoridus.pdf
    • http://richmediahouse.com/admin/uploads/file/35772777507.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/41621089471.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=capillary+bed+sphincter+muscles
    • 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_off0000eb4e.bin
20429a99b053aa77e8fcc9b39c3110ba424d8b284d2aa7e20c1f92156e6f7ad6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 11044 bytes
font_01_sfnt_off0001049a.bin
ea7bc258be4126f3856c003c7c8fe38ff5502d23a51f0337e3705b02e72a7715
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 16780 bytes
font_02_sfnt_off0001305c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 16792 bytes