Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7073bd8105e6b69…

MALICIOUS

PDF

76.6 KB Created: 2021-06-09 19:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9bb42c1d57d481b4ce3d4341a41fe4ff SHA-1: c42f210cd45549bf5551a09ae7c7577ec18d6f26 SHA-256: e7073bd8105e6b696463f1536e3a3b1a1c3a5cbd60a47ff426576cc6f9278873
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of a link farm on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=present+indefinite+tense+all+example PDF link annotation
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d76f532f2eb4aa07755b3f5fbb050b2f/sosufobezenuvadupi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/firawatuvole.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8dc63190f5ee429efb95addca99d8b23/fijezelepifanopo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3363ba08b---8759599608.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2d123330---panizalukukixofedave.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8d92db48e0b95029877147b6c46892fc/merotig.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497fe20a0b---16837130730.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3e5034f93881d6e05a8efcad4dc1410d/99926339429.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a338f6613d---32832790685.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/dudefipuzegivuxi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/99ed3c39c8731603414255157fff2b0e/45836663569.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/kokatoga.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/08d7041201e34328274424e96656b67c/towivetoja.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5ba75c10---jesuzego.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hp0i7nho00qf44c4tugtcblmv4/58652277689.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lqv2k6rfttilr2pdsmemtltpv2/21020447077.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fa2ec6ebee14f2a8eb56e7515a362a29/20891812994.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/bm5tb60og1v207dubqls1leck1/24540775384.pdfIn PDF document text
    • https://ancoraeducacion.com/images/79170649720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 5256 bytes
SHA-256: ef621f042c51afed8d48ad04efc78724ec9b3fb6e6239c4f3742a73d70cb9673
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 11504 bytes
SHA-256: e1dc8df98cd11bfe96fbfdb70402a38503001d69e54688567e3527acc8462fe5

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