Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c884378b1c35736…

MALICIOUS

PDF

96.5 KB Created: 2021-08-08 20:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19d9230caa5ea64a22bba0c7ed759b0b SHA-1: 41b81b3a8778e5359fde6490c3f93ba908c03027 SHA-256: 6c884378b1c35736ac5e30f38df43de2f4da9a54113d9ecf2ec0834e31c859c9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body was unreadable, but the presence of multiple external URIs and the link farm structure are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7363

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://em-mould.com/ckfinder/userfiles/files/pebodusor.pdf In PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/70547876962.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14926fd2e---jewakemakejil.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3bc93c24e---gurotonitubokinolutexa.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/83042726408.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/i276bjo8l7adqb8ub5skvqh71r/voguwubujojes.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/xosamuramenowolonobajatus.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/runasa.pdfIn PDF document text
    • http://mp-journal.com/media/file/11851705240.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/155e6ca67cae3fb63ab57936b4d7addc/mimewujolixa.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d065e4ee89e---jurevemo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e176cbb97---31017160423.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/917a0a1f939b70cb2a3b53373b330d87/86971167016.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/43554276799.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/pemesorinixomazuso.pdfIn PDF document text
    • https://estoniapools.com/contents//files/faluparononat.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/pijedamipugutitowokinemo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fofadavinefovowizus.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/j6meov0r106slgdnq9gv92k6fq/gatibu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e49f52629c1584b0b5cab736007b98ed/guperovenefuruxati.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/tazelivurudubufoxum.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/59946355934.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be704658384---nubebonerajo.pdfIn PDF document text
    • https://orrizon.ru/images/file/wubuzexevivinukopinasimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=uc+browser+new+version+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10624 bytes
SHA-256: 2abf3bd4c2a93e115f5b98fc692dfdb59375d2050a30d37086eeadb0c13c8fe8
font_01_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 19496 bytes
SHA-256: 35fef1a7bdf9087bdc23b05b7150eca2393ae17cc15c0605500bdee376d31dd0
font_02_sfnt_off00014f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000167a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A0 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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