Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb3997d09d27e59…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 11:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e25290b762bf453249a2cea592e412c SHA-1: 243a3d17261da7e9ab37cae9d8570bc0bf05565a SHA-256: 5eb3997d09d27e59f58e7fb31edaa4aee743615e7075f590168820a5a9681dfa
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or employs social engineering. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to trick the user into downloading a malicious payload, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/483cd5dcf439003d42d5a2abf8299989/jedopumuvegobo.pdf In PDF document text
    • https://betalinktech.com/blmedia/file/zudenapovugewuxakifega.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/jazimisesenakosope.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16127c56922bfa---85128121519.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/nelaxukesudelasuravim.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/77728879169.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cb763aa4---pivipizilalulogujobuwetu.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210815232651439022fvr35.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/73384252497.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076057065796---95718491106.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50ce8efbc---47027442961.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/42587905082.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/wibajowuzoxexo.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/72083411194.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8fc17a85d40e1be12e5d2f5f21f2ecb8/41549619804.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc45bfa2175---werixe.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5460752d6---51813352487.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/rojumofofotukifiw.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608788a1d2853---23708328225.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/zerem.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/9730441360.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c416777bff7---62334994126.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gebaxafotiwikewime.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53b85d2edf---romotabokawojuvisodifoj.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q8f53nlr355d7fgskbih6dk4fh/143408023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=electroswitch+lor+manualPDF 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_off0000e404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 18936 bytes
SHA-256: 294d2ca7caddd7706818ba2af5e065609c428f9f9137297edd94da4942ea77bc
font_01_sfnt_off000115c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 10664 bytes
SHA-256: 4264da068db9b219629e8b2359748b7a60d18aae0167682cfc9e0c1f4ab9c32b

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