Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea871c0d7eb7390…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 12:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6f7cd9d8c61e091dda18e003c73de4d SHA-1: 9b5b7beddc19da9724f16dacbbc2a1e11a58aae5 SHA-256: bea871c0d7eb73905db6784fdc19bb502635b6a4f44e38efe0d215e8df42a543
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=save+scanned+documents+as+pdf PDF link annotation
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4c9d3a886---62356001807.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/pofebubakezop.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/xigajajamuva.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/88880300130.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/51076499528.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3a9ec5ir4m8l06fe978k3thnt6/54655641274.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb4f03790b---32975919124.pdfIn PDF document text
    • http://ezibra.pl/upload//file/62079464014.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcae511014b---40112448828.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/rabopavulo.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/jofekebuvagutodalosegop.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/61939935487.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dba9a129b---5049436420.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1625835845.pdfIn PDF document text
    • http://axwelindia.com/uploads/fadegetijaninasutupamed.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/13882506025.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/97646500044.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/2855229633.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/xizukuwixazanuvotirav.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071beb80d5f1---81779693125.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084c26dbb639---xaliwavimidalomamatorofo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160854f6ad63ac---62763961908.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e82d048942---57023686709.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bb1a915062a5c32dcc15205c62431f29/99222848240.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_off0000bf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 10784 bytes
SHA-256: 696a42e5d05537347e20e3ce85e2fe5d8b83f4502afa17f1c18033000160c6d7
font_02_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16244 bytes
SHA-256: 251ad8335aeb0d2f5a4d7fc9b39edc79f43e207c958aad51f08159ec9b8ab03f

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