Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbdc174ca6278cb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 07:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 579a5337e239b5f2a3a1ad9873aca816 SHA-1: 97ca29a374c89fb0dea732f257b5d1e8cb19d2b6 SHA-256: 2fbdc174ca6278cb707037ec8f56ab963546b37abaccfc8e7ea3010a841ae0cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dcimx.com/files/14156165777.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3acfba528---gipaki.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/gotonovomop.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/rulesi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea4d507ba---20955119138.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/62213349189.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/gutavemarew.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b756df7f5---povisevozirasapa.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/vewisivijijise.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3473d1a26---5477200131.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/34378687016.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/11523636747.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/dizomegixer.pdfIn PDF document text
    • https://oferta.lt/i/File/bivinexepolerikudowoxapi.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/putajirulugopudorufira.pdfIn PDF document text
    • http://farmina.ru/uploads/files/79333755919.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/wodibajowuzimisanoko.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fa4f3da3---jobazudasasesolarumabi.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/kexolojukefas.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/36801190380.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/kuferezifimefo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff95e6eacb---sefemukidejitozum.pdfIn PDF document text
    • http://thongthien.vn/upload/files/18326568368.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/favaxabotanusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+longest+ride+emilio+scotto+pdfPDF link annotation
    • 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_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 10868 bytes
SHA-256: 88f24d8599bdbe9ae534f3df8b7080471140a8b963dc37f92e49fc4329367b23
font_01_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 17764 bytes
SHA-256: 41ae6953257b7f7086eea50f6c06a011d3c6571f9c839ab40dd055ca5df6111f

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