Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d773f44bd2ea58d…

MALICIOUS

PDF

84.3 KB Created: 2021-08-29 17:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5cb70bba6ed6abba768c52b84399eb7a SHA-1: 18083e52c633bd47597e6de0a7a2d861f5cbb179 SHA-256: 8d773f44bd2ea58dd4326396fecae5af6fc56e4a88d71d22caa56f491b703908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the final destination. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or scam lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drafthe.ru/uplcv?utm_term=build+your+wild+self+avatar+maker PDF link annotation
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/21025973369.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/suzibigafidinerijex.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a067159c3d0---60065228793.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/foruxuxofalin.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/50383507590.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/buruduwusezejobogide.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2889ae40a---83759016065.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/nuvejadefatifeluno.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/nivotasijuronubire.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g7s8b39132j1bmjsg6s34gfhsn/76309336938.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/rutetolivibupalupuzutogi.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/f04fv7rgvsp3eibnkhdvtgm4ci/53760126420.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fab4ca32c---33422395051.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ph98h3l5qvj8h9itntj867lc2/4063044887.pdfIn PDF document text
    • https://olterus.com/contents//files/36929563341.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zaxexedazekelugivisor.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/jusidejibelufu.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/fejezujirezasum.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/tapuxipuwiginoxi.pdfIn PDF document text
    • http://hotstamping.pl/files/file/badofomuzake.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608035ad212b9---33976548960.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4v544i51triq6uqra1pieemt8q/bopuwonesonelusiwo.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/74803381421.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/25305022555.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/sbcad86g5jtq6uch6gfbbt8tb3/zugupugov.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/zofaziv.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wonigog.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/96154364715.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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 10920 bytes
SHA-256: b333cb28da80a45746dace11d85a47f722948075f322cc3d42a8ebb3e52b5200
font_01_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 17620 bytes
SHA-256: eaff53be3e9011f1c659b38b24367c5d7dae8869a875e970e22f4771740fc177

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