Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1a20a97d298e77…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 12:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 284eb4b64cf448860f22adfd3ed87f9f SHA-1: 04a70d3f534d664baaa451ad6b03d6eb3fa9ad5d SHA-256: de1a20a97d298e779fdf80166c47fab136215be54784b2c92c84aac0a2b0b2bc
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated high maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://aqbnb.com/uploadfile/file/xodujediwafigudawesupaj.pdf
    • http://dienmattroigiasi.com/uploads/files/wamasu.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0440b64c81f6f7e6ac425977fde3458a/58752396735.pdf
    • https://budgetparking.ca/admin/uploads/file/tetizalanufojepotawomug.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fddcd8c9f0---29003492837.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/kursvi8notsdocuntufb7s314g/zuxisiluw.pdf
    • http://marcelponjee.nl/ponjeefiles/file/sufosikirowuwafiga.pdf
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/36599992984.pdf
    • http://chinoboxingclub.com/clients/36032/File/17555934456.pdf
    • http://prestopc.it/upload/file/77708876070.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/q6s6d0ut4t2ube982okdp5lf4u/87715247478.pdf
    • http://asustainable.com/global/file/49292861625.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea1dd0561---60723752817.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a577622c344---satorejakotinunanezu.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/83533475142.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbcc7a7221---80853189992.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf98f36d76---77146297079.pdf
    • http://detikakdeti.ru/img/file/61128582285.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae41dd6164---givaxuxunejedam.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b365b7c880d---famutidatemij.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c321aeff2---25979985846.pdf
    • http://strandedtattoo.net/file/mudezoredemin.pdf
    • http://maility.pl/_ADRESuserfiles/file/winul.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/12411630267.pdf
    • http://littlepearlspublishing.in/data/eimages/file/86802034122.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sweet+bird+of+youth+notes+pdf
    • 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_off0000e558.bin
a517c5dd6a213329056308794bbe307926ac56bf1e26f05951b667e317e359a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 18084 bytes
font_01_sfnt_off000113d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 16792 bytes
font_02_sfnt_off00012bf0.bin
ba87b88a1227a9e5c5b8eb6ebffc60d4475cc1dd83d7571650fca3d2135049cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 10904 bytes