Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da9eec8a2a4c869…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 14:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86d9347cc4f6eef4039a5dc8d28a7ee8 SHA-1: 2b64168f4f03813827f31f05e211fafc1d2f75cb SHA-256: 1da9eec8a2a4c869d2f54f50c503f34f22294cd4bb95b2f70f22fa0bc877f257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or scam campaign. The primary URL, 'https://queure.ru/uplcv?utm_term=sign+pdf+on+my+phone', indicates a lure related to signing documents on mobile devices. While no scripts were directly extracted, the PDF structure and extensive link farm point towards malicious intent, likely to redirect users to credential harvesting or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=sign+pdf+on+my+phone PDF link annotation
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e6b4b580---61285675318.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8720d6e647---98743279301.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/99597536386.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/retuwipo.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/45189958780.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/418af0d57119fb47b59792ab3201a6bb/59557637730.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/gujasenedodupo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a16199044---43988390500.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/bizulitonaritulu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/fepoguxifaroleduxa.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210823/file/famuwomurofotiwozuz.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5b7e1511e---96772940644.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/kedewuladoxovagadon.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/54547304809.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/45597289168.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/tujewo.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20217236521712.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec053488d9---nepaminisudubiwevapomuvo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/tesibatisixenares.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/bojivudi.pdfIn PDF document text
    • http://www.pvvc.cz/files/tujufanifosowavuka.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b41cb01c06244474b5c5d495f6da1634/melagepotelazobeluj.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/fobifagazojejukumad.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/rawaveporapivizebikutuj.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608261901d3c6---30648641611.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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 17324 bytes
SHA-256: 8d847daa4b78c0e040da6c34b1b516f18bcc35449d6f723cc0d072ab5f4c299c
font_02_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 10560 bytes
SHA-256: 177b26b450089e0e617839b1777cb262d9350ba65569b095e26526143a2c8b06