Malicious PDF — malware analysis report

Static analysis result for SHA-256 109f290f699a883a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 00:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cc5accb5c93b910c5c0d1e8cb89e1d64 SHA-1: f0b2cf244ee3ece500bdf8ec9c08cb437f6b4149 SHA-256: 109f290f699a883a2240510bc7be02d80b916276e59012c92a23458eb17e9ee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tomas-music.com/contents/files/87705552119.pdf In PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/55192182341.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89775371328.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/33952235818.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/xulanuboxozi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/604bc9f0eb30df857089e72a92b21d6e/88790621777.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/zarukisomala.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210906095154.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xatodebisefofotakax.pdfIn PDF document text
    • http://boki.hu/editor_up/lonaruwuvakorokil.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/26162990403.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/reluwuwifalip.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/sosojuzafoveko.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/mulofologukamur.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132001789db4---33488019809.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/20087764380.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/xaweke.pdfIn PDF document text
    • http://surausa.com/uploads/files/xazoxewape.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/84171430538.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b3b928c82dd80cfd108fdf8aa1f10a3b/tinuvelomosoto.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/fapepixakujogenabobi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138059347986---53882437182.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/40187602720.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/xitixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=meditation+bell+app+androidPDF 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_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 10352 bytes
SHA-256: 85cdd0991f5f15a9aecdffa8dc59ce8a56f30e1a69171e321d665ccf0b3b1c40
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 17920 bytes
SHA-256: 2972701bd2ed294b9c8bd0a8bdf800dea24027c48c8a827b879ef3fc52ce7f51
font_02_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1