Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cfaef4cc282127…

MALICIOUS

PDF

86.5 KB Created: 2021-08-23 11:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d081cab681dc501418c724b3793b5940 SHA-1: 0b320a314a7883198fb393e88849d2c50aaa3e24 SHA-256: 83cfaef4cc282127d74c5c3f009451603ff29c322b86a4a72f3f5928206a4be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious payloads. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kcss.hu/korosi/userfiles/file/zowapuwivi.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/nokisamewejujufi.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/balatutezotoderovudad.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c84395d369---55064377404.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/zubaterosujimobaroner.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e3884cc8d7505029094b7a35fb7c373b/vukajefetupolopetaxoj.pdfIn PDF document text
    • http://watch62.ru/files/files/leduvinarivazi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ba541d53---gopaxejarilimupisibezib.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/sijadirulamowaboxedis.pdfIn PDF document text
    • http://614move.com/clients/4890/File/2337376607.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/89556527052.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fc1acdd73---21904603930.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/10679167101.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d00fdea95---viwidizegawedevejuwuwar.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9ba31a7bc92e3ec7ebffae755000ff7d/97497436926.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623963317.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7357ebc16c---18109728175.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/penifulowolusuviworufavev.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/96ae273752e85ad934ff805574ce4e7f/64780724010.pdfIn PDF document text
    • http://nessium.net/userfiles/file/tasazugisasusizidoxo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/901uqja2ej68rrl4o6ucsmvrb8/fufowotopemelibibu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cac7ba1bff---67857038587.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/43217747125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ombre+nails+short+squarePDF 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_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 18072 bytes
SHA-256: 623603631c2b532b2ffce60b78eb1dbfd09653edbf2d81cb300d557fef1c4e21
font_02_sfnt_off000133af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AF 10784 bytes
SHA-256: 1311316a3f75ef0e0b5f2edc5d581e97237a7920f9cdf9ef5aeab5c0e91dd6b4

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