Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d0dffe63511899…

MALICIOUS

PDF

71.1 KB Created: 2021-09-02 00:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96cb0bd0de84c3f6d7705ae3053f129b SHA-1: 0d7910309e818df56659aedb746ff6be9e4ec57c SHA-256: 63d0dffe635118997c3bf3a762f1f437bde9bea2b22c0a9df694b2dddc6419be
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bad710be13f---62232486176.pdf, are key indicators of this redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160907912d727a---mibixaxepavopit.pdf In PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/47255855846.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/cd996fb63e0871dc8195a4302d7c6a31/tidamed.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/94344085155.pdfIn PDF document text
    • http://strap.sk/uploads/files/26424346039.pdfIn PDF document text
    • http://glttek.com/userfiles/file/jakunebimidotonisatik.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ee6jnvi04eenisbfg7kg8hf94/dudoxume.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160793959435f8---botefudujurevomuw.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612b0659f2c67---zajededoliw.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/76895448393.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bad710be13f---62232486176.pdfIn PDF document text
    • http://swotaweb.org/img/upload/file/jugitelememeleto.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec87d05d59---15642158267.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/18926106358.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/fizego.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/jaxoliva.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/76704339174.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d2208af940cb3d830a0369789a41c291/rupujepameber.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5c0a2dbd6ddeb0713f2b00e09f3bd473/58562015174.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/667e542b5dc20a32d2c1c256a7cb5caa/xuvomamarimizivudolurati.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/tuxujujagoraduzemidoju.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/banafukeworafuruji.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9970b886fb---73360881515.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608959246c69f---towadodafezumowujagobot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+see+methodPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 10256 bytes
SHA-256: f941b442e823446ae96c1b0f470cbbc7f05c65a722391a036a7f62718fa106bf
font_02_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 14312 bytes
SHA-256: ff9188c5d37879e0a27b04f1b72b583b3a62c21aa2650fc937238930e4bd0728

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