Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7cba0d22da756c…

MALICIOUS

PDF

87.6 KB Created: 2021-09-03 19:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa25bcd61707d6c95dba61f53b026441 SHA-1: 7be4f64fcf78e6d99341ca4f0c236624f56654bb SHA-256: fc7cba0d22da756c71635f5ee9ee062324a69f078a450ccb100eb2ef9d8c9f8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=stool+examination+report+format+pdf PDF link annotation
    • http://www.museopizarra.com/ckfinder/userfiles/files/zogixeweneretufene.pdfIn PDF document text
    • http://abpaluso.com/upload/file/wuforobamatujepobimi.pdfIn PDF document text
    • https://inncredel.com/uploads/rutifu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/5124735712.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/83089699791.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a7cde540---xeraro.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/diribuzelafakibudu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f1bae6e95a185e74ce5edb7818110430/93948453371.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8538ad0cfe---jevoripakup.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/megazobotaxima.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/2955055822.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/74122386285.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/fowavawataneri.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/lenumuj.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f471d08ac---fadabebuvemiwov.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939ea37cd0e---29351324710.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/kozuzopanekod.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/78738712526.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/90249034620.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/80119069454.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/lavajexivaravem.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210825_DEC5BFF4489CECEE.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9534664dc3---gexatomadex.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_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 18844 bytes
SHA-256: 046dbcfc3faad1f817855c7f6ccf7dd9d5be63551d7aa76e9f5e8e87778af151
font_02_sfnt_off0001384f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384F 10668 bytes
SHA-256: 64af1ef83fd1f1c02eb3ff34dcc9fb3d4b702d3136b5192ed1900dc794e5b569

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