Malicious PDF — malware analysis report

Static analysis result for SHA-256 640df0626c6469b9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 13:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1d5b37664ac2ffde77482300b749d58 SHA-1: d43debfd7e31cb76b83d9339d5c4f6c26321614a SHA-256: 640df0626c6469b91ea344fae7d43b3ed4b70e2d724fe788d20e323d89768568
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e5367e1dee739a232476694376d662e2/zexutumukumeleziwoten.pdf In PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/15041356838.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210915202835.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133f77fcfd42---74847427283.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/xewofajazutejoliguledora.pdfIn PDF document text
    • http://biomehl.com/images/content/files/makix.pdfIn PDF document text
    • https://polaria.cz/images/file/12754990393.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/batebifor.pdfIn PDF document text
    • https://vitanov.rs/files/jofawalurunilazu.pdfIn PDF document text
    • https://rajaunited.com/contents/files/polexunaj.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210905124354_tslog3.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/begenalusifixiliraba.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/57110881513.pdfIn PDF document text
    • https://areicon.com/images/file/joredebikurodesiliwiw.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4afddb754d03a64820e733ea4561bc39/rilizarikegotuwop.pdfIn PDF document text
    • https://phnews.ro/files/file/21126087393.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/1211601880.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/43030911216.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/7526185719.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/gudafobose.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/32129373883.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/38903635114.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109050320274336.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/95629971082.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/71711253499.pdfIn PDF document text
    • http://blccy.com/userfiles/files/66212318443.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/zuboredudanakafip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mortal+kombat+2015+moviePDF 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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 10716 bytes
SHA-256: ff2b17a05242df00121518d64a0fade636086552b4243bbff789fc8c055507ad
font_01_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 17408 bytes
SHA-256: 36941dc6eb6c3d59d1988c59c00aa4b7f9ce64936383ed3690c1ea0cbdb9c55e
font_02_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1