Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee06b4d0481b7cd…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 10:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f284a9c718b525f749fcc679d7747f0c SHA-1: c2161913faa2d16b25e8c50f2fe257827f9d3dc4 SHA-256: 7ee06b4d0481b7cd21f21fbd57cc4a9886b51b1d992f7f831c631a10987c53c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into clicking malicious links. The presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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=module+4+answer+key PDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e493bdde9a---55424768567.pdfIn PDF document text
    • http://flirdining.com/uploads/files/texazusapaselututoba.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/43331179586.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/48884981844.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f7ec6b8a---47623573822.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/rarekitiwivovanikurorek.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/259090bb2378dfb5d977328c8b4da6e7/86002118935.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/56606184127.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/3354704994.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8dc59a35---baxateniluvudo.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/tilif.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/47687711220.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/nodaxepudirulofomasenim.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/94188284587.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/76266850938.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/86077488285.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/renotepoporoka.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/12380098231.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/136085176.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144df50e2c53---letivazeku.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/25686383959.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909235246355529.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/disigavugekak.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11450552797.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/031303365542.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/zipafibikufowid.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/63004219012.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_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 18388 bytes
SHA-256: 009e8f6e482e6df350563cacb5630ccae79dfd7902aff481e75f51dd681acf31
font_01_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1D 10516 bytes
SHA-256: d35018a25356f7830ee2ee4114d79f44bb638454a629a4a31f47b2387d3169ef

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