Malicious PDF — malware analysis report

Static analysis result for SHA-256 704c0a745e08f881…

MALICIOUS

PDF

73.9 KB Created: 2021-06-30 22:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0567f921cfc0eb32a6af46192183698c SHA-1: d4a31a87a8d5d052e6f35bb21dc85a69f80fe637 SHA-256: 704c0a745e08f881986a2e5b2d15c67a67a2bccd609a959df54ee38011b310c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ayurveda-shiatsu-qigong-nice.com/upload/files/67483607772.pdf In PDF document text
    • https://ka-base.no/images_content/file/41709998694.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/189cf40d72eeac10134c88e0318c8e95/supumabegolafuketezawe.pdfIn PDF document text
    • https://cubic.is/userfiles/file/83264923500.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4449435bd5---butunefixajan.pdfIn PDF document text
    • http://chromavials.com/d/files/rejesadulukaluwosarajan.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/77953263012.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/vizesejeked.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/88950217617.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qte46fmh4am1trrkqhldnpf145/27934628225.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/nalezoparapelazezemebuj.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/36421001765.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4b881d6c---102998624.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/4163335027.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/13311855759.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9906a9bb4---kezijosigezewugulowim.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f182ca20cb---bubemox.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/lb4tcdo18u74lcerv0ftchn5o1/dafiwikesad.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a43667ed389---32833925032.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/86ea1a51f77198ca450018fc22d00464/levate.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/98148966083.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a3c87e6f5abf4a6360140cb727bd5547/tekosimepojewexizufo.pdfIn PDF document text
    • http://gewald.ru/content/Files/bekewajovirixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+much+would+a+150+pound+person+weigh+on+the+moonPDF 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_off0000bdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 11444 bytes
SHA-256: e3fea5668abbc55b95dc335a60f0e6e11b298de84d241494132bb4cac771c619
font_02_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16108 bytes
SHA-256: fc72227b1e21e2dbbc86e5f50ec0be389b306d2458e5480ed139ae618a68e34e

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