Malicious PDF — malware analysis report

Static analysis result for SHA-256 30147cc1533e7a9f…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 23:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9fce493ce0ebaa0ed8131d6f16aa812 SHA-1: d08a5753252fb889bfc9ebca8ce5bf0bc086da2a SHA-256: 30147cc1533e7a9f03fc17707386713854e96d0f3b4aea09d5f1897a371a7353
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback lure, prompting users to call a number in a deceptive context. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to exploit users through social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://wjvanderheidedienstverlening.nl/uploads/file/94999542167.pdf In PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/77817996455.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/zetomisiwir.pdfIn PDF document text
    • https://remini.hu/userfiles/file/ruwiwemowofofid.pdfIn PDF document text
    • https://jck.ro/userfiles/file/binamibak.pdfIn PDF document text
    • http://talleresjpg.es/img/file/tawosezozadobulu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134080585795---zugamoleg.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///45168635606.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3f05a94e3ccde8328c479fbc15d56495/jevegogig.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/mesupakegubevefigut.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144d09222087---dizoxul.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/60313186251.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/55350252309.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/51515023325.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/73733734049.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/76982611270.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612feef8a2e5d---fusojerazosenepixa.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae962f024a---38100835248.pdfIn PDF document text
    • http://baoveantam.org/upload/files/wimefugotikugajuxatigam.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090617230373499.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/seresomiwaduzugevuwiw.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/jujusiganaxodudurakunexo.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/71540898794.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/30132883100.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/nexaweku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=more+shortcuts+apkPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/47800516550.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_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 10416 bytes
SHA-256: ef6724194a863c10ac7ef6aa580a0c959d4a0b95f463404885faddfa211ce2b7
font_01_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 19380 bytes
SHA-256: 53cdc5a156e5c13099b51752ca34ad2ab97c64a9d086da87cb3be9a8212f2701
font_02_sfnt_off000138c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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