Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76b1141fe0e2524…

MALICIOUS

PDF

68.1 KB Created: 2021-09-01 04:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0846c029074c27f0e9427acb48fcaff SHA-1: 7837c8765073089e05662300d4aaea695608ed0b SHA-256: a76b1141fe0e252444b4e3a8152a99808e8e7cef499ef48676635d871fd61c52
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot disguised as a document. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the distribution of further malware or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=rlcraft+download+for+android PDF link annotation
    • http://deurenhanger.nl/userfiles/file/21386338118.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/91905896402.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/l98ub10ks2nrvj6t2qgct2g715/9993636387.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kakevesagosujur.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/39f321f545ed17821796b97b2af3ac99/879093612.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb212a52d4---63025843920.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/kagikupetoponenifosega.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/122b98b2dee90036d2d8f7df283c091b/74900111785.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/zavap.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/27670004776.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/83783016081.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/vejizesirirabokikaf.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3ce2303f---4037360101.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acf3ef5d613---zarojaromireme.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca51c8dc21---62945971154.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/rqk1rqu9kjqghg036cjv0i51e6/55301379108.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/27270808171.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129514be56fd---lepinexelepuvixodejeguzip.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/76599331044.pdfIn PDF document text
    • https://advik.net/userfiles/file/89577494971.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ee6bd36883ervb4fj16kkud9d4/24808702169.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/54491095262.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/sotijuzor.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/zitewapiwitefirifi.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_off0000b0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DC 10300 bytes
SHA-256: 08f78a140dbaea385bb7a43c8c2099266f0647b866cb69c530ad837f2ee1678a
font_01_sfnt_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 14204 bytes
SHA-256: f9f7da122a54d0f2b19d099a5808eb36679fc76d7b35b44c0a79c4243c3aef4c
font_02_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1