Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec17779320dab53…

MALICIOUS

PDF

68.5 KB Created: 2021-06-11 14:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: daa40ef4cbaccae00b4d0c299fc1cfbe SHA-1: b788cca3acbc6c127cf7f30ff1e22df6491c71dc SHA-256: fec17779320dab5332381fdc55cc8a2ffed7d7103f58c186c898ea118ef0d757
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading a malicious payload. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=modern+economics+hl+ahuja+pdf PDF link annotation
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/87f602bc9206112cdc626e8173d43369/jatifod.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/5kt0kqpl7d05b6d1v4tk98sde4/rubepafavagelotum.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4895e2665---pinuz.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/56377322391.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd22231c5b---80902277875.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e09573c404eb0aacf1d1190f18c7a2d/zekegajapataronax.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846e430f62---88116682955.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987d05264fa---davozegeridobuvinusim.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b013a963197---dolededelowujevirefen.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f29d11786bdb68747accb1d669db8583/86294775180.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160877f3911eee---muvulapidamapedujoposebok.pdfIn PDF document text
    • https://unosms.us/userfiles/file/maxonomakezadowuleli.pdfIn PDF document text
    • http://beateromer.com/bilder/file/nazedokodunabe.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1b45318eb6befabeef56ff3cdef67bc2/fufuluxovekoxi.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/81470273416.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16088737c7fc61---46226231131.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/pizububuvu.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/67021346387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 5476 bytes
SHA-256: 1d70ec9d72233f6d2a4bf2e28bfabba6dd97f7f54b218ccf583cf2bb70c34d93
font_01_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 9928 bytes
SHA-256: 56fa548349a8fbfda9cd2b67670ec601d38458cbda99a28fa13d976f481853f7