Malicious PDF — malware analysis report

Static analysis result for SHA-256 15455f3aaec99c1a…

MALICIOUS

PDF

136.3 KB Created: 2021-09-03 15:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: abb5a33164251d19918d9002adeba31d SHA-1: 278c700aa9e15b9cc4bca21fe83d655dfd1f73a1 SHA-256: 15455f3aaec99c1ad046bbcd3cbe5ab1fdd66324645e66c0ddc967f5284a752d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of numerous suspicious URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/64acfe0bc113a23ecc3fa3341abf2552/66607371937.pdf In PDF document text
    • http://gioiacompany.net/images/upload/file/90529211385.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/bobiwiwumibimuj.pdfIn PDF document text
    • http://minerva-collection.net/files/files/mafulaxonegexiloxuko.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/11111389447.pdfIn PDF document text
    • https://poker-fire.de/file/63741255472.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab32eba2c40---lefetabej.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/69222394286.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/52284051604.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1017e03ee---4831223033.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/lawoderosu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6olqn3q2h14hboqmq3a4opfaul/kanuvorabefi.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210802234707.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5e6a54bee5e05d67df5cbecee385f67b/suwibanifelakipo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ir7if2ui9lq339eva2erf6k785/bewumigumixajisubovupiw.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233e548f4ba---13748165589.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sekesowub.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/6830691341.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/75606209585.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/pipofafogoreri.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da5bc221c6a6af495a059d6d319072c8/61619933583.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/80282910120.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/85809366673.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/21905360189.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074034742e35---bibefefojevisopafaxofox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=yuvraj+singh+biography+pdfPDF 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_off0001b113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C925 18784 bytes
SHA-256: 16bbe708bae01e5cf88fc713fe34c31160bea3b0d93a2a666efa04b08d52e6aa
font_02_sfnt_off0001fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA43 11032 bytes
SHA-256: 9e5deadc220ac6433e8c6e3ac56b7447bb02c5fdf02a7f2d681a0d0239ff04dd

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