Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14a9193e5ccda9b…

MALICIOUS

PDF

86.2 KB Created: 2021-06-09 20:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c297d0d8365942e40d7d87615915e19 SHA-1: 156b23863403230dc3753acb1b6164265adc7413 SHA-256: a14a9193e5ccda9b4ec313fd1f2cd27980226f204c65e7381efde2a0b317a13c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits malicious characteristics, including a high ML classifier score and ClamAV detection as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern, likely aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=my+hero+academia+heroes+rising+watch+free+online
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb5614ad73---70960357521.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2686463b5---tudewuparetovegezazavox.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723f161ffb9---jufotujazapotazoxebuman.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/e2423cccea85e48b5ee3e387b54f1056/vujozufelod.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/4e8dc351d67cfec36e9c6b25540dcf36/31422778892.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/15101270276625d7949a4da8ceacdee7/zatumosefu.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/97b13ec1d94247b488596a65a917d7ca/limutaxawo.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2dfc7af5db6375f2a7123068a48badfe/tuziwetesipowok.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/4a94ff8c68980acd9232b889b0e3f625/76468307889.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/59laduiiq0b3ratqi6fnnmnkv1/27799982412.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/224637cf7f034bf6057947693c229eb5/61457300676.pdf
    • http://rolmech-strzelno.pl/Upload/file/webefodexop.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69d85faec950170f6cffbfae78041707/vebaliluzaze.pdf
    • http://aklond.com/UploadFilesfile/%5C/2021050605355816.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080cbd6ae5a5---memijiwopupizuxu.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6afac3bb---posifufotovopisejufuxewew.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/g188f27lfirvj1hv507nrd1gv0/kifebosaniju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000fc87.bin
af167c98d275c5a3d9b07a2c4bde9dfc2942a76c971ffd05929af43b16a333d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 5636 bytes
font_01_sfnt_off00010fa7.bin
0d8e0ce0877428093ff5121755f6e80941d136aa22b1d8120d69a129d75ea720
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 11280 bytes
font_02_sfnt_off0001366d.bin
5338b60dac2ddcc9fbf81734882903060897ff8c18563aad6864a581beec55c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1366D 16068 bytes