Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c8588478184a87…

MALICIOUS

PDF

83.7 KB Created: 2021-09-22 17:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e598b086802887dd9bb3b2cdb0df9e0a SHA-1: 8a80b5fcdb5d2d9905047594e8ce45107ceb6c57 SHA-256: d0c8588478184a87843cfd58a0da4bd731d0bca3a4394aec032af0349494850d
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a remote-support tool lure. The document likely aims to trick the user into downloading and executing a secondary payload or granting remote access. While no scripts were directly extracted, the embedded URLs suggest a phishing or credential harvesting attempt, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://laborke.ru/uplcv?utm_term=control+my+chromebook+from+my+phone PDF link annotation
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af41a924ee---toxodolezajonugikunaxe.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f97c0902ca---gasavugipiguxod.pdfIn PDF document text
    • http://iveducentar.com/uploads/assets/file/87756055953.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1j2mbs06lb0o4ev2uckq025qe4/31783336183.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/solasavisi.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/xubegonidewomobisamizegi.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/fubevolaxakivibobani.pdfIn PDF document text
    • http://freetds.net/userfiles/file/wusomubexinovewegukudu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613907ac8682e---85861306064.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/jerem.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/4171154985.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xitikinogavufebelulu.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/guvivogelezutenamezopa.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/38842559758.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/31835642104.pdfIn PDF document text
    • https://drlanda.hu/user/file/fitekuwowudimigarok.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/aa5095feb82667c44113c8f30a84c5d9/57507972975.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/dibuvibofogeposataxojebup.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/lopomovexezaxe.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/17779221695.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/18279877205.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/10501803142.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_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 18356 bytes
SHA-256: e5cdd51ab7248ba8418455b72fa43f50fafce2c4f334143ce58a3be54dda7c51
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 10700 bytes
SHA-256: 3d1642864e23b48cc49b1ba48ff2f4f8720697e0b3108cc968465cea331b37f1

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