Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49bdfff5172a4e6…

MALICIOUS

PDF

97.5 KB Created: 2021-07-20 04:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 506b2df2d3fd35b6085eca72544a6c91 SHA-1: 66593daa223d49a4632ad921c2c19eb1138bdabb SHA-256: a49bdfff5172a4e63310e630b306738e426194947c5a8f254985eef0790f5829
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://palcev.ru/userfiles/file/11480573613.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aeee47759---36389528727.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/12006686989.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/44497150173.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/76705891658.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1099675298---16814546727.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/lodujevewizir.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d477ed23a6e04713a86872da5fce31c9/wilafotikaduzugadiwebomi.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/48203692584.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f870d3bb61---nutokudonorip.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc0db6cff---josatorizo.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/33794857793.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/68458140828.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/20164059585.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a858a8e5660---48360846535.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7fb75d6d---juwumebonazo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ba10ae1ff---rabikuxutodizul.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/18397411206.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/20432449058.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210713_045929.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c035ce47---dixudujozodorowonut.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0c6b4e8365e87a0fa9d994b8f8ad014a/90124745984.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52ac67ef6---80569673755.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5moj3labh7ss8ikhakss1bg8qb/25584837120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=guess+the+movie+from+emojis+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 10856 bytes
SHA-256: 910d0060d388b0f6523d6ff855c9ff1a416d77ea8010e285ddba99c9ad29b663
font_02_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 17336 bytes
SHA-256: 10ca0bd28d72b8e9925cadd51696ec6281653e6ace5afed8635703ebe1d7e593
font_03_sfnt_off00014c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C59 23764 bytes
SHA-256: 34e07d05326d4da487eea7442e8303098a305e94c71280c320891d014a371e99

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