Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc19bbb449e6592…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 16:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c335e97c97f81ac0e2b4f201397a38d SHA-1: ffecea8151cf3d4632416ff4f6c446cdddd80aa0 SHA-256: efc19bbb449e6592089f6a7eaf19aebb3cac58b9cee8b74169e19dff975d4e09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several heuristics indicate the PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vinocastillo.hu/editor_up/48355719070.pdf In PDF document text
    • http://ride-on-earth.com/images/blog/file/fuvaku.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210907081503.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161320d44a0666---tupofi.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/97335603232.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/lawaxebuwulaluwepe.pdfIn PDF document text
    • https://network-italia.it/file/sodamitumukeweja.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/9e8sllndgfav3dqkq43addafmu/92099735897.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/nevinek.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132766dcbf38---3574939883.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/92046465260.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/92560884089.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613340b2e131f---tafujujunu.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/jixemuro.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/lutulajozovutajibanodax.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/luzaxojelawuzebusujujaze.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/62686871714.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f00c4876---53229655206.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/28688186447.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375ba2ab90e---jejejorupiwimi.pdfIn PDF document text
    • http://talesma.com/E/file/34534441869.pdfIn PDF document text
    • https://majubesar.com/contents/files/22330201888.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/vizugo.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/filere.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe02abfad---6962975909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pantallas+animadas+para+androidPDF 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_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 18628 bytes
SHA-256: cc121f86c35f221a9be132335d8741164279f445cb79df88de41b3e3d5bb9bcb
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 10424 bytes
SHA-256: 92d6983df8753358cd913b080b1135548a73d19f235e5d54e2bbac31cd669124

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