Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f71b9ec4df4482…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 07:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 736c00a9f998ed4fe978cc1505feac21 SHA-1: 7514fd6137282f1bbc4ea56b799b552cd112498f SHA-256: 02f71b9ec4df4482cf4efaed8c33c49ad36643a436114b0c635d6299e6413f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to lead users to potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded links and the 'PDF_URI' heuristic suggest potential redirection to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=download+android+system+webview+kitkat PDF link annotation
    • https://sinarlangit1.com/contents/files/55439411167.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7bd90fa7e---23987744896.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/wejulijikunejekatenomit.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/vevisazape.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/sorajiri.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/fibima.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/tapefa.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/fodepudewotuguk.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/2626241888.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613396b7329e2---xiwivawimi.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/34256969305.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9deb40f9f---rurojubafowuri.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/suzufibuxa.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/19felhra0ddtcg3j25euj2gga8/45577625832.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613635da75e5c---nemogugi.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/43589087147.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/kadakujifunoxorigeve.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/zekusiwuturig.pdfIn PDF document text
    • http://ux-school.ru/files/files/furazulewesevat.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/xofeta.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/29416254788.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/25396395942.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210912021002.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_off0000c438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 10908 bytes
SHA-256: 879105cf1e0a14b5b6f5575746c22588311c0b2898cdca6868cf2f0f30bfee12
font_02_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 16440 bytes
SHA-256: e8bca7d4367f11a8209d633ccfafdd1d218d78011007273398273c58528d5642

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