Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e66df5976521bd…

MALICIOUS

PDF

65.1 KB Created: 2021-09-19 23:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1a4af66ced7fda571d88e75469c3b89 SHA-1: c5b8ae0e807a96d60ac251c2e9036321a6191e80 SHA-256: 72e66df5976521bd7c835c619767142ff3f7330ff731c4add2a689b4a1ad3223
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and link farm behavior are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8532

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://pistant.ru/uplcv?utm_term=switching+data+to+new+phone PDF link annotation
    • https://imaggu.com/ci/userfiles/files/wezuxaxam.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/40054189350.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/28773002660.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/gajalugoxenatutisu.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/78350585152.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/sapuxamagogipojipogekowad.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/pezagotuzusigarajurora.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/sobesorikaxi.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109121514297709.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307046b9235---16517318811.pdfIn PDF document text
    • http://taigesw.com/upload/files/nawopadubir.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/bizunisizunawumenotikef.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161349ad21234c---sujivovofeloxad.pdfIn PDF document text
    • https://betsin.org/userfiles/files/kobozarusanaverotuwel.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/59911977334.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/zutulebojemuz.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210912_24F0E1A5074A99EA.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/dezawez.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/nenijegurupi.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/nukipowigaxizorekanedaru.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/padezowaregozikigi.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/xosorinadeligubinaritif.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/78723b86aa9bab313e888f888e07dc4a/zedug.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/09863c2a6f169faf82d196ded57d1800/11657033994.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/muzujitonud.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/58e9359e692207a13a6a9621276aa881/62719005166.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 10640 bytes
SHA-256: ef230f2561b5a589da87291dc42e40d3711791e75b90f42c6ec6719e16428329

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