Malicious PDF — malware analysis report

Static analysis result for SHA-256 8211c4a46768de90…

MALICIOUS

PDF

94.2 KB Created: 2021-07-07 12:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01cb514396e23b7948e235bc92b5ebd4 SHA-1: f33979f0021dea9ca9543e13191ce248c135a8db SHA-256: 8211c4a46768de909f8399b6b172a39f95f4e4a4d41fa9f55db4e0e4ca714edf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress installations and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9cd7021e---dunilagemimizav.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/temaxadonetilif.pdf
    • http://biurod9.pl/public/userfiles/file/putotuponugu.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a758663e018---kaxijujeba.pdf
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/20131051708.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/424a98c4329ef1fd3c8c6e078c630766/91247301108.pdf
    • https://ekransamara.ru/files/pukefijejowa.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/92556945040.pdf
    • http://xedaptheduc.net/app/webroot/uploads/files/7409700267.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/gawixomaginufisopar.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/58da1e90cb5ddf9141f582a0a606779f/89741126462.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754a605c1fa---79550201608.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcda7353d9---31294160560.pdf
    • https://bushregenerators.com/userfiles/files/fukarifamatap.pdf
    • http://hzzxtl.com/UploadFile/file/20210705024243116.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a4be5eff38065fb7379740fcc38be93b/voguzowavozuri.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/9mfv7ubboaqttmkqnvev6sefef/65084612232.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=insert+into+postgres+multiple+rows
    • 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_off00010a31.bin
ae4447e4f0ca97dfaf2dc7364784b78d80732a66950e279219ef493e99876cd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 10572 bytes
font_01_sfnt_off00012256.bin
a1e9346ac5c62f354dd0d208495b3f5c2d669c4f1f101784ec10c55c0f0f51c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 18744 bytes
font_02_sfnt_off000153d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153D9 16792 bytes