Malicious PDF — malware analysis report

Static analysis result for SHA-256 f233aba35588fa13…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 22:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3839cd17dafb7f7be5f30b6edc3220b3 SHA-1: fa450428770e83b200053fe8240b841f53af6a5c SHA-256: f233aba35588fa13df6c5fe38212baa89bdff5af9b5f257c97e6a240e8869c43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate the PDF acts as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bca28380---fisuguvi.pdf In PDF document text
    • https://panificioilcavaliere.it/userfiles/files/jomokuxosekogebi.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/48490155472.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/xamavapazipofofegugobom.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/40764794952.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/dubozigedimajamowimotebem.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/71420619639.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d12d58cabf30ba7aeeb207fc7eb156f6/bekazorinezapanudane.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/bibowosozuk.pdfIn PDF document text
    • http://mobiliteit.nu/files/90075472984.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dcc132284113f1fd3a012067fce0311e/jujuxixewipopevepudilejuz.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/m6j1f3ptfl1t1cn6hodbdipm77/6212646783.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/5fb52d6aac14d434eed4edf1ba103501/83597730289.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609757d3e5be2---97288595286.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160863a987906e---20233131351.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c5574cc7a548bce47eaf24b527ce0f37/16756435935.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/57249841940.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4948f2442907625391843545af825ccd/xebaxetirefekatifafawu.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/4174842566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=e%26h+vortex+flow+meter+pdfPDF link annotation
    • https://lapdonline.org/file/8220072876.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 17812 bytes
SHA-256: 36487df97420493f3dd6e848f51081f5f5291d523038790731ca24274efc61fa
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 9056 bytes
SHA-256: 50af47e608971db19a31747049f134e3cf1fcbb29243c05f37cdb0594e930b16
font_02_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1