Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1114997081af493…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 20:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 079fc57a6a41eae15455d5c47e4aeb65 SHA-1: 9399051353817c9db703448eebbd15b31a41c148 SHA-256: b1114997081af4939e8f59ea820239db03f668c72592f9f932880fc48c30b58f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=carefusion+micro+spirometer+manual PDF link annotation
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc6a031291---rebulumopivapofu.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/rotiwojovudixodositi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb6e14133---47342270849.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/55723772973.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/11127492390.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/guwobawewikixe.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ada5de54da3---zanulawu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/njoiuh3g3s2355934mq8mgb9t1/dosaguzamix.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/50b40dda77a98ec75462a1719815b7bb/75823522195.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/78936402158.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/fixivomamizexojavafene.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/riraluzozo.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/58274767786.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/60669095495.pdfIn PDF document text
    • http://netflor.pl/upload/File/49917251491.pdfIn PDF document text
    • http://sinoorchids.com/image/file/wotewoludonabuwupewor.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/282c64b58825852d5c52b6b9c9d7ed77/58350573935.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tifurejujonamowem.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076df06242e8---18969116928.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/56808317021.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a8fe6cfeec9e2faa91b91b269e1bca0/barazufated.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/47235631812.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c082b2330c5---8196714366.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/57665803513.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_off0000bfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 16388 bytes
SHA-256: b3f7438ebdfcad3111872ad84a14e308490f20a086d8f056b244740cb8aafd17
font_02_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 10772 bytes
SHA-256: c461f20c41bc46573c4c1f4e6035c353bf2bbe54bce1c14a35964a3eccff5ae8

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