Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c6559aab13b024…

MALICIOUS

PDF

79.6 KB Created: 2021-08-28 13:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 149c140cd2a7426958a24cdb1f1d7ab2 SHA-1: c88d3ccfb8b981aabc5298ba82cfb9df48356735 SHA-256: 41c6559aab13b02425a0688fb688940d7c7e0190157ca09f1f98180774b3319a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS uploads. The presence of numerous links, including one pointing to a raw IP address, suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=absolute+location+definition PDF link annotation
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/davezenogimuxiboz.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f51510f5---91105341479.pdfIn PDF document text
    • http://blatt-gruen.ch/files/rideme.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a928b11d3---91905021281.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/80094099185.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/62402565505.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/dikipape.pdfIn PDF document text
    • https://lapiadinafelice.it/file/61142771878.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca48d55080---lofopipuxaluvivavulo.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2e9bf8e17285a585996f9fada452d497/kopenajex.pdfIn PDF document text
    • https://stauber.lt/images/files/falafirugobagejuruke.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/kejigumolupumogifatasosi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/55a119e66e4989e00678e9a9d49f957c/kolelopidap.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/20882074826.pdfIn PDF document text
    • http://140.121.176.106/ckfinder/userfiles/files/21390571215.pdfPDF link annotation
    • https://irisapp.cn/uploadfiles/fckeditor/20210813/file/16287955752685.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/90335373107.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/32347552847.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d696adb9ef5---sagamerumuvavenezimomo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1478d7aae---famekamimapesinidizojaz.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/36475408684.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/7833812766.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/madupisapijipo.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_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 17072 bytes
SHA-256: ef8a3f407eb42d1c7d222d87f1c8b0ebac1dc5a50923197d1ab523763023cc37
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 10592 bytes
SHA-256: 1f2e0f1814da86884a31fea66f6a792ad87cefe33915c213785fd44330454eae
font_02_sfnt_off000117e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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