Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7dfc67f10fd99c…

MALICIOUS

PDF

77.5 KB Created: 2021-08-27 05:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 51549fdde8216995ab3c0a4e73eb53b5 SHA-1: 382d2616bc3b6bae3c9dea81407e2c8d437f3a1a SHA-256: fa7dfc67f10fd99c3d6736362963e7d4980861b2e11df4bd05074dbdae257bf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4aa1df8febe3fdd2d1c16a3f73cc539a/sulapopilajebewag.pdf In PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1060a55ea4---42515006165.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/33727719425.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc6429382a---97921580233.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/55544761072.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/20421018916.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cec7ea75271---vawivotekefadewevimul.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/90684452191.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/ginozaxedewirikezirika.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8972b653---65524155310.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/78359c2436b1c842f447bb57a99d06a3/vuzabobaxise.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/vawesox.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/19036557361.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/hms6c6pnsqvuf2ko6h5nqim8f4/10747527449.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021071703454880.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cbc41625d---rebemizejosolon.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/rabavosuvasewufofusobi.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/70827017725.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/wedozaromajuf.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/serotimujezepivivugem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=we+work+in+the+dark+to+serve+the+light+quotePDF 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_off0000caa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA8 16516 bytes
SHA-256: 5a2b7cd3d4b32132e74f1e9029999e420d63ab12097fc609603ed71df665b061
font_01_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 11012 bytes
SHA-256: 013321581153289992d9a20bef97701176b21d56e666cc816c6a69f74cd5ba0b
font_02_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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