Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63da004ba567660…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 05:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af4deb0f58507f3c526e96346573ed2e SHA-1: 5f35107606f680db1439b30ac515182aa6b74063 SHA-256: c63da004ba567660295547c7c4ac4ce56346a232854e78ed4d7e2ce44bad909f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://alnoorcity.com/userfiles/file/83693758711.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c9e1ad95b7c---10944535915.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16123ca96072d7---jojigasuzutujabaroji.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/48119155510.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111174b01d9a---70548002359.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/70344339439.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0671cdada---6003578315.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807efa49f20---40943650258.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/27456827736.pdfIn PDF document text
    • http://recviem.ru/img/upload/jupaminu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/sevopagepagisomuj.pdfIn PDF document text
    • http://uhorder.com/upload/files/21407990379.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/ganobelenofox.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/74e3ad0003a771924cac3634d56532a8/47587189111.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/26235beac2a9efe6fb604e4976f75c27/31958975073.pdfIn PDF document text
    • http://czminghe.com/upload/files/89869942514.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/65300071528.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/48710932130.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/46484158785.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/tukif.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/subabidew.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/zexipu.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/58260447897.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/t1mbmmfi5oav0oim844upk16sg/wabonaloxikojotekiko.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/c6e87514781e0bda6ffbf2a5ef31845c.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/13501598714.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/filepifobelodonitob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=my+dog+is+nauseousPDF 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_off0000d892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 10384 bytes
SHA-256: f6c18d3fc33e66c43c3017a528002ef8519c4e25a0072c4846a1b48bac22f596
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 17652 bytes
SHA-256: 7b5dacaf83942f909132970aec54a90f4fec8ac849b631c3831956bed7e2941b
font_02_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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