Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df2d8ff940421a4…

MALICIOUS

PDF

95.9 KB Created: 2021-06-06 21:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1833cda1d3d7f50cc9da5b088f78c27 SHA-1: d7bd03644b6c154378a0a1fd1b037bdd34f60360 SHA-256: 1df2d8ff940421a4afff42918dbe18ab5bac8eb9dfcd880c6140721de646c97d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a chapter summary, likely intended to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=resumen+capitulo+36+rayuela
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abce331d41---36088563581.pdf
    • http://erdivigado.hu/userkepek/file/maguzovewajeb.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a556ee5b0f---68262519171.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/cb66c11ffcdd3043c938c5c032991399/jowesirabawupum.pdf
    • http://breakevenpoint.pl/uploads/editor/file/lariguvu.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/04eh6ie307rik91ssrhta4o3a4/73779724046.pdf
    • https://loctra.net/userfiles/file/varogesodexununibuxabo.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fbb8317ab---piginosojurelexewazabugu.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607470aa76e93---46354333732.pdf
    • http://temple.mo/userfiles/file/ladawileka.pdf
    • http://anaminfo.com/attachfile/file/makejesububejaxuj.pdf
    • http://dajuicebarus.com/uploads/files/2331369632.pdf
    • http://bulk-supplies.com/userfiles/file/25822364725.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092ccf31005b---nunamofo.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/53924745e1248cdd628476b8a22b8c13/26798068000.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16095b213a7a59---62157947976.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_off000125ae.bin
95389253b4d012746af4d341599e4b3ab685a90e652706d1ec315b4c6fd5432c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 5508 bytes
font_01_sfnt_off0001385a.bin
76b20287ff979c5609c50167d020803cadde2724db5953fe3d803af676c45b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1385A 10344 bytes
font_02_sfnt_off00015bb1.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB1 16204 bytes

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