Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ae394e3b9e0a5f…

MALICIOUS

PDF

86.2 KB Created: 2021-08-02 09:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2efe1fea8b000537716890cbe852e805 SHA-1: 2cc37ff2ff9b6d4a10e3bce7eb99e2df0c5c025e SHA-256: b6ae394e3b9e0a5fbe0b2866428df1a7d0b76852a0b735ab095bfd76a45c7eef
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, pointing to various compromised WordPress upload directories and disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. The document body is unreadable, but the URL structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3358

Heuristics 5

  • 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
  • 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://umrllc.com/userfiles/files/37058316842.pdf In PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9b9397cb651931d119b525c18ebac542/58617704297.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/badodesinaj.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/lejej.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/78301094618.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/kegot.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/99449cb4fad567d1910471320f3e2a9f/xapujukukivatikuvuwu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bdc96046f---zugokakusikir.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4mf9sehnoocvm06ptqoadlmgan/fetefaw.pdfIn PDF document text
    • https://isosklo.cz/uploads/78807735923.pdfIn PDF document text
    • https://2acontractor.it/images/file/loberifiwut.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607474a102bbc---87551726131.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/067878d1597954b4d235ee0d4ea95486/24500993357.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1dd35493e---terafogoxu.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/f3462e52dcd1d771ba02120b7ad30cb5/loratirakopafuvix.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160943f9dd26a4---13839131929.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/94008271924.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/varumisateniwivasotib.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/58566371493.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/lezixoxupowo.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/rumubozuwutopag.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/tepasexapekol.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ce58190ae3176660c0dcc570e158a36f/47044497924.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/25595872405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sql+complete+guide+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 10752 bytes
SHA-256: c34906df034cd4257b7ab66f3b6736eded6eefe2495df1cc0f88b5ed33b0edbc
font_01_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1