Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c00be4679e7fc61…

MALICIOUS

PDF

82.2 KB Created: 2021-08-17 09:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6a7f479190fa1eb16fda2281533ce7b SHA-1: 2c983f6a5a036a346786cfc589d9ca92dbc2f31c SHA-256: 1c00be4679e7fc618f41a092c0c3b470a628df08d8d62453edcd53a9e8b66fe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=frayer+model+map+definition PDF link annotation
    • http://btc-ltd.com/upload/file/gufupulunuzerebiki.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4f2e40f6a06de5fdbed0b49cabcac822/12335948309.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/xonotekoxilamikilawuku.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/aa24680aa81fe7bce42b907c08bf4ca9/72735841597.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/wujowemusebewurixow.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/aog7s0skpe051pj73k8u37jeda/mopoxifigudex.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/runufanovav.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd6782772e---dazojawotonezexiramapi.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00c033c43---pojuvexexobebudi.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/35271009020.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/054a8ba36e5e6d9f41c6e73a99d65db8/sewejivuv.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/64202998033.pdfIn PDF document text
    • http://myredm.ru/uploads/file/72784389651.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/89612798041.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/98953162793.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/puxugakoju.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090d1ad9fc8f---30557162059.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945bbd011f4---89545836796.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a2d9a72e8f062c15651ab884dfaf9beb/35388664856.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/tufidakakumes.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/46c37c110b3ffa6429caad5d5a7d9d1f/ximun.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ea3f2eaa---96403518876.pdfIn PDF document text
    • https://flyags.com/editorResources/file///vomilawabanil.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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 10584 bytes
SHA-256: 9887dc6c64c0fd4f8c7494fc0a67b7bbecde41e8b45a6b5ae4b274d553498941
font_02_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 17856 bytes
SHA-256: d8532befe91d6089840d719fa8b19845362a3659a67dcd5d8e4852b4925e798e

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