Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace64cdfc51a9161…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 10:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 80200748b2baca681ec064713f7c22ac SHA-1: 6b7d24fd862a834a923663b5137839462e575460 SHA-256: ace64cdfc51a91613e8f0760516d5ee9879a25b79c93fb84136561eab97f1d7d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to malicious download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=downloader+for+fire+tablet PDF link annotation
    • http://izeninfo.net/admin/upload/files/67379741206.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc401c70e8---givodulax.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9185517a---xututo.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/64139616036.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161336d7e6532c---56505408706.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/fanafaw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/464df0c1d1e3c45161babe960172179f/rofesuja.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/714370881.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/zasabetipewejivulodipixo.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/gozepafimelewojap.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/waziralafotuvanikire.pdfIn PDF document text
    • https://ghnservizi.com/file/tepapemume.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xorewasakunurejimuxifo.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/zapevoniwesege.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134387934968---kexubena.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zuxumozatovuguxibanozo.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/34180643745.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/zenida.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/wezulitatam.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/kuguma.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/11142884348.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/r4qr8mkqiskit6nhv0s22qpdg3/vagopesabapeletizetul.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6132923CE055E.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/kuvek.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 18428 bytes
SHA-256: fca38a7e7eb1b16cb59b71d8ebe4115689e0326f7e3d7396bafaead3ebe461a9
font_02_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 10404 bytes
SHA-256: f1ed7ec4225e1279d30a10710bc1cc04c71dacc3542b518effa8d367c2759d4b
font_03_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 17688 bytes
SHA-256: 72ae2c5c25a641b1aef838eec5b680b1c3d05651111831d40631c9bcdfe8770d

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