Malicious PDF — malware analysis report

Static analysis result for SHA-256 2867530c0b151dfc…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 18:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0826b9398f7961be7c7f1b46e900ba21 SHA-1: b919b8731af64884597093f4c799e0e9c4a41c70 SHA-256: 2867530c0b151dfc8f0429080bf44e5c2e55d5672b91765b1c81262708cee7e8
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host and distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection confirms the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • 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 http://cgpreceptor.com/ckfinder/userfiles/files/sebegarufegaba.pdf In PDF document text
    • http://autowassenindex.nl/images/uploads/kigupegoxafet.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/35474210940.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c388fa8f196---5050110590.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870bf1d90f2---64224241879.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/4hovrvc21e0hvjgqgb53cl94p9/82665697342.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baafbb67bbb---jaziwa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c29be0c1e41d8215b79f7a811196c509/97318868767.pdfIn PDF document text
    • https://777mto.org/contents//files/lawixub.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/virigokifubagepikufubizo.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210901_095514.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/16149732894.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/bitigujakebimaxuxigofa.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/67073023397.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/8570911758.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4pm280ne8slboinovfsmpr982a/35111427019.pdfIn PDF document text
    • https://drsaman.com/files/83168624127.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/6h818ab8bdmocgtqeolht3a58o/xiguxukowefa.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/14656942250.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/bugasotudijizubesu.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/dituda.pdfIn PDF document text
    • https://vitecolte.shop/file/45641697791.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e967841f---33664775146.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/pevagowipusop.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607854e8e76f7---mivenofob.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7757ca9f79---13001928898.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/dabemutewazewivalu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609804bb068be---rodewegunusowizeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mitsubishi+pajero+sport+2010+manualPDF 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_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 11172 bytes
SHA-256: 9828bc972b74748dcfaa652bf0014dd8387d2406e7848a1031e701411826e417
font_01_sfnt_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 18832 bytes
SHA-256: 19da8dbf9b4b17122ac7c3691b75258e6f1c745089049d9aea8b75653db91bf6