Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc366251fb71ae4b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-03 02:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae41fd1ef4ed548850d7537b3edb34b4 SHA-1: 72060ed9d6faaaa9cf8fa5345044165706dcd84f SHA-256: fc366251fb71ae4b99ed68c8db80d3cba239f7b86168a8e9fc744553853afc15
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external sites, some hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or malware distribution campaigns. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=it%27s+a+jungle+out+there+sheet+music+pdf PDF link annotation
    • http://nghiencuuykhoa.com/uploads/userfiles/file/dibegov.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/79143373026.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/nq1kmncakm62vai0iv8eul61bs/75106901869.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8cfa1118---74243989412.pdfIn PDF document text
    • http://regcureguide.com/files/files/57170471836.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/26510456636.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/45738969784.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/gebinar.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/sezesomira.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/64867447178.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/49604664091.pdfIn PDF document text
    • http://zerosquareonline.com/file/67864596761.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/88621406455.pdfIn PDF document text
    • http://apothepharma.com/upload/files/35078199753.pdfIn PDF document text
    • https://actor-conseil.com/files/file/ruwudodiwigawojejuxego.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fad3ad450c4---vexalar.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-8-25/20210825193719135997.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/619743d723934dc8dfea0fb7af87b84b/62987527978.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/61759265694.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ef9fdb39f9731c82a80abc9ce0bd0c98/88114247228.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202108312043242219.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/dozilarenakamuwipuxef.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/rejadoj.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce887f42d---nuzitisadatijati.pdfIn PDF document text
    • 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_off0000c1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 11284 bytes
SHA-256: a1facd4cb77979e8c7b3de39e3a5cedd939e5ba57aeea2fae34cc7970ee25d25

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