Malicious PDF — malware analysis report

Static analysis result for SHA-256 83045243da8f271f…

MALICIOUS

PDF

82.0 KB Created: 2021-07-03 10:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a815529336fbcf725012d2b3cfac2896 SHA-1: b77f4570989b8a4ef83420fa822eeb3e93273f85 SHA-256: 83045243da8f271f9db8a67f95fd251f6516418b79409029505878d05b796374
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=percy+jackson+the+lightning+thief+graphic+novel+pdf+free+download
    • http://immobilieninvestors.de/userfiles/file/linapipipuwuwasepoz.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6e6e06e83714d6732d21f5ec614d48d4/vebegonubiduz.pdf
    • https://aulacvn.com/upload/fck/file/51969503739.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/9t39fg3q5kksv3hr2kbudqve6o/petofoba.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607da15ba9d7f---8330668875.pdf
    • http://bellsazshihtzu.com/clients/878694/File/nekutumigamuvaxipovoka.pdf
    • http://ttlh.vn/storage/ckfinder/files/pebute.pdf
    • http://zonwering-nederland.com/ckfinder/userfiles/files/9003428542.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/msnr48ki0anuv3vjhvesesccgv/81052297078.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080547dc5369---7676927753.pdf
    • http://shukokai-voves.fr/userfiles/file/71379275828.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d3b32eb2f3eddaa267796e3a3afd66b6/kokuw.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/m34ggqfu5tpq36bt3ohhb9k1o0/giwopulobamux.pdf
    • http://derkwoo.com/upload/editor/files/27000837700.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d126f33db6---wokupa.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6bd87d1fc67357ff0180421c41b1cca3/vopagovuvome.pdf
    • http://files.ibiza-ferien.de/file/kuvabojapufegusulusak.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe82eb3fe---tuvakarawoso.pdf
    • http://thehigh86.com/clients/13680/File/301484649.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4faa667672---lumazujelejigaxug.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/944c271c436cb8197b12dc3ac8382363/pivipiwaboposipulavupux.pdf
    • http://geotersrl.it/file/litawifikokuzaputekojo.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f8b71dad---pawebojifoguf.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b78739ed5c7---63838600065.pdf
    • https://ebookstored.com/1423116968
    • 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_off0000d9c6.bin
1327670a932e7aa3f9ad9647e38ff9fb1ff5e0487edcd9ea033d3c64e4400f77
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 11388 bytes
font_01_sfnt_off0000f468.bin
a1680feb8c27b35c91cc1493d8e7ba4f8cf21daf964457a17035022cf0386660
pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 17304 bytes
font_02_sfnt_off000121d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 16792 bytes