Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7f4c421de283ff…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 07:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9c52f8341abd54da387f7f26c4d7bff SHA-1: 9391387e5f770c1d17a9d6eb532078e734d2f91b SHA-256: 9f7f4c421de283ff82c6f75fd0637bcc7d35428b13b707cd68d861a16c9eba98
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

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 http://n2nlah.org/UserFiles/file/gaxajejapide.pdf In PDF document text
    • https://unserbiokorb.ch/userfiles/file/98818542903.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/b8gsjggpcbbmu764ms1s0olp1f/69288702577.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160921550a774c---85548418763.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b02e7d9a---1047721732.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/hcpopvkh6tjaa7g01d0b4025hu/tatitiguvo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609575c56cb05---wowozadofuwugatokejo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008c1515a94---fepoxulekip.pdfIn PDF document text
    • http://makaroma.fr/upload/file/kexifidojapopuxareju.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/41883203146.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/55106113680.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/mojepotarusemigizoponiwe.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ru4h65nl5ppd7704qf7glrungg/82686798909.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/netelonezisipugomokiwiro.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/83d0ad7edc207d5c6bce7476a5b9769e/87835157813.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7118803607---90473313707.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/46775511746.pdfIn PDF document text
    • http://primaneighbors.com/userimages/73796795606.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd26f6a609---46973949930.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-25/20210725011757509831.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/10078648266.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/tuvoxeporigo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051420483327.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c03b4a1760721ef4458fb56a2a44fd8/31801646724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=descriptive+geometry+in+architecture+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 18460 bytes
SHA-256: 17021e99e042831565e7521c02a2409afb29e4c416cd79c5ab73ee33298a037a
font_01_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 11300 bytes
SHA-256: 2c5c1b90b3caff717f5c8e3fe96c3d87f27a659af01e3e5e947b81f31933ea4e