Malicious PDF — malware analysis report

Static analysis result for SHA-256 4348d01012a30d42…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 20:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f661091624ca88ef4d9b7667384352eb SHA-1: 610a93fb3686c8188b694ccbda4de6c7bb8ba58a SHA-256: 4348d01012a30d4204102131451ca65d1521d830d9f9dbeee1b2f4022e3c6b93
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly 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 https://cructi.ru/uplcv?utm_term=jolly+phonics+t+sound+worksheet PDF link annotation
    • https://samarpanbharat.org/trila/userfiles/file/70469192173.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c49288ad4---puwigi.pdfIn PDF document text
    • https://asiajitu.com/contents//files/93318835539.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bizibupuvowimetem.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/fepeg.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c3abc0cfdd28e530aac2fa9586f97ece/kisalirinewuxexotam.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9dcf061d4---lexoxumumere.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/dibezuzotebuzawosoramemuk.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/21441712061.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/zuvol.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161111d5001b1a---93808578733.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/kaxefuxosa.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d3c2b59f5---pizakodejenilejurupus.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/frn9bus4d98ufg955bim1ntvlh/4736425535.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5337c6bd8---sodifurajuxikimutalu.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/24832717396.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9fb8fe84d7b732c8a4fc1131c7e91ecd/68228968641.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4ae0188e8a2a9f8f9d4362b126d3bec4/piziwirijixogonof.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/54349026261.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/18754574693.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/064b788d284a6b2af836f394fe721114/kibevuziwefi.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/lagopusalelumukudozukud.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0894327cb17e7ea73b4749da7be1049d/28705783159.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/1415076195.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/sasulesalasujer.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/gejatekakujejebekewe.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/62683856945.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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 19072 bytes
SHA-256: 2a021a262ea7647e216d457255ed44bfdb80a05be3da3bebf8d336bb491d9bd7
font_01_sfnt_off00010d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 10832 bytes
SHA-256: 2bbefa8b14ed751a17e5b1a55407ac5b3a5c7de97f0910c488107972b1413955

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