Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d231457f2b5874…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 03:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da807ce8a4b296440bcf908a84ab8719 SHA-1: c7d41475d5b136d1ecce0d26f829e65551adda24 SHA-256: d8d231457f2b587424de1cf113363b7f3db75363360296a227b8888d823dbb3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tonwen.org/userfiles/file/79073330439.pdf
    • http://nfc.soo.jp/file/moxipowagi.pdf
    • https://musikkursus.dk/userfiles/file/35042738486.pdf
    • http://appartementslisa.it/an3_Uploads/file/sovijubarezimebilemer.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/kipilebiviwobejaw.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/18835478272.pdf
    • http://kpdb.org/userfiles/files/97439593234.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f629635d354b4f46e93351084ca27d06/70232992967.pdf
    • http://manilag.com/FileData/ckfinder/files/20210909_DC111FA3CCACB566.pdf
    • https://chowdhurytourism.com/ckfinder/userfiles/files/tulufubudoxigetuje.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/40baaf11e5cbdd0420edbea4a346ca78/23382072014.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a20f7e805a---fovajeselobisejufajefom.pdf
    • http://bluelakehomestay.com/uploads/image/files/25276915053.pdf
    • http://zlzljc.com/uploadfile/file///2021090207261786.pdf
    • https://growyourmoney.in/userfiles/files/46587985085.pdf
    • http://radecznica.pl/userfiles/file/82575905117.pdf
    • http://jenistudio.com/upload/FCK/file/rapamujoja.pdf
    • https://derfo.info/resimler/files/14632510502.pdf
    • https://btegypt.com/file/29306359199.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/smfiavi5na442gi7ifj5qbv0ut/xutolepeniripifetavuzuma.pdf
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/madiresi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=iphone+ringtone+maker+app+without+itunes+sync
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1d.bin
68185e6c413485fa920d61d22dfcd7a7288bd74de76e2dd820e5bec971e98aaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 18308 bytes
font_01_sfnt_off0000fb18.bin
77e09769f92b93611cf20bb82a5ff247d8e7c6d8db2f7078f7b9b949639fe181		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 11120 bytes
font_02_sfnt_off000114fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16792 bytes

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