Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8b51327888ed74…

MALICIOUS

PDF

90.1 KB Created: 2021-07-27 15:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cacbde4a5a9961d5e104d8f6de73b8ee SHA-1: f9a1e90da3bfe2b5a0a4cf77c86943030687770a SHA-256: 7f8b51327888ed7492c02ffe6653618366b0c14b9f4dd41e52e7d8652b7e98b0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for malicious content or phishing pages, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2934

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/j226664fit9ttupt70milo3rg3/90712613977.pdf In PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/74270702290.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/54814783919.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/2309022677.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091edf2c39c7---pipubigomifakesiduvufoj.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/tupanoposulegepi.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/55842bd0bb86f815afbd92814a561ab6/sunanerok.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076037ea979d---11016847873.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/74104074729.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9gvsb9ii4hpg6i9en25k1urno5/monulufamodefuxavaveluba.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3ae40438757d737f3d9a0f9acf1bb512/55649321348.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/3560943346.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/akj6vvgo3aqg4ubgqth3l3kpbd/forenudaw.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/wobotubozafa.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7b411bd8620b8e4c5a324c0a41a3a2c/zurozabeda.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/992c8a3dac7a892d29fa59c51cd79ecc/82676486140.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cc83ee25e---13418798515.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c26382c7---38918499135.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/52590616564.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16083c4747f80b---dokofuxukuxamemivojomemas.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/89020779534.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/74292475050.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/padebefowi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qft46pf7rm0j0uecr873djek7f/galajefuzuzok.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bf03b2829---48807637688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=business+plan+dissertation+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_off0001173b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173B 17520 bytes
SHA-256: 6e9066081d93f31aca5006c7c44f1613e3751b7f778014d5d60739c3584dbd65
font_01_sfnt_off000144f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1