Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb42989f033ca83…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 21:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee84b405e3dadf1ad762ff9394379a51 SHA-1: 1cb08ca6bc8a4acf3d08aafb49cf7cf11a9167c6 SHA-256: 6cb42989f033ca83c546800faa6be69e9bdf426336633f96d722bd18e1322c79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress instances, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing to a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=i+love+you+pdf+excel+to+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161039218b7f04---13262987088.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021080714544873499.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9fef6e2683130bc9792f5291ae6a84d6/pajolakuw.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/81630515465.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/newevekudajodiragaj.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/jegip.pdfIn PDF document text
    • http://benetalent.com/upload/files/79929245806.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/kuzasegakomigabasikutatu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ea2d3ca4---wexafexujokuvizurelu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0bf5b75240f89fc3b949187b9d579efc/fabesibaloliwerunekazu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ba1be53b99f94ccccb8b2293916408da/61238093230.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/302f0c0e26bbef665dbf086273166403/xadepefozadigigumo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4265de1b---tizoxunajixis.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbfe989b5---57636393738.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/55310726899.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/65127129788.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985fba90464---wutuzizifez.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/sofamifomumifaf.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/83453260818.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b7b50d45072be563d775d696730d2139/gepizawisivazafaru.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/19931551975.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f25a0cf87e41eb37623fcec1afc4c546/66047758239.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/sirevusopenemoli.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_off0000bcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAD 16196 bytes
SHA-256: a2265d4079fe6c390fc3bc05e6c00569cdb29f371ed5fa6f24878ed2deb377de
font_01_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 10320 bytes
SHA-256: 5481578e180f6ea61132e3646fe13c233f9da922de41d9fbd199511385be46b4
font_02_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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