Malicious PDF — malware analysis report

Static analysis result for SHA-256 533131ff38bd73cb…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 16:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 88ffee1441cbfc2afb9e6a8f6faf97c2 SHA-1: dd6903e0fabf1b98e02d8317b259618fde0b34c5 SHA-256: 533131ff38bd73cbe038d7e2cbd6b49b5c0413b81e9c8c3d2aece19ccf3a0817
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=god+is+a+woman+choreography PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6d7c3f0d610d9e4777689f81d8c3a516/20715412226.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b41b7d1bd1e96ddd3b010d0218e7fc07/pudazo.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/faxevipojimisuvapa.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/b2lohe8bkus2sik5khe5b0ca70/95942951475.pdfIn PDF document text
    • http://roocenter.ru/upload/file/juganijezolabitugonagireb.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f86643884a---vupedawabasovoku.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fdde77268d44e83e3ed2cd6bf466ede3/98257713509.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83d4f274c---pimawezutevefo.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/57146046319.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/9625650428.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/51160958615.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b219a914cb1---wepotanolegaketegov.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/77084614441.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/xenibaxegafi.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/83121630254.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb696ab3b4---92601290368.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/kudiwatuxofijuluk.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a86a9ddcd26---84706883620.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/pikp1pk1ptckf50v3u6m429d6v/88380048459.pdfIn PDF document text
    • http://getem.pl/files/file/lusag.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/55750624772.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1dd983e0f10f8768fd374e29b56937a4/2441686380.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 11056 bytes
SHA-256: 6369d22c13d04aa84ac0b229fb76a19ad3eefb0157fc2526ade69ed3a2b32a37
font_02_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 16772 bytes
SHA-256: a12e87b2fed5cb0f55022190a84806a3b316697d85b9a89341e5d2c196f66f2e
font_03_sfnt_off0001453f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453F 2264 bytes
SHA-256: 39c0f3c95dce6f4a59e9514ddd9818044513988a5abcc3fa14b6344d567c455c

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