Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbd3de872b82cc5…

MALICIOUS

PDF

74.8 KB Created: 2021-09-22 14:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0e31ae7ca55587022d1129cf59ba52b SHA-1: 0e9929046cb2fbddfeafa290c513fd237560f2b0 SHA-256: 8cbd3de872b82cc50fb9293e293c319d329883e0a3bbe284f8c12c2946562abd
124 Risk Score

Malware Insights

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

The PDF file was identified by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3916

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 https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba4ce4ad44d1ec88400046e6d6525a0e/71337833782.pdf In PDF document text
    • http://gorsilawfirm.com/userfiles/file/85512702681.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/potibokosutetopez.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/52f798ff148d5171eabb7395d5f42252/8895241211.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/71683261605.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/5346372944.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fa55s37phek5ntfk04l3frrdhd/kaxavezu.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/73190377670.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/maserajefimitatos.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/navavipa.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/xikenapowegodo.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/45585666485.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/65721843411.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/21332418942.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/rexazaziloniwubabib.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/25581977909.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/18753349018.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wevevino.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/43892648044.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/94371495646.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa5fe4b35---megope.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/26512427094.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/98775313545.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/keverolorovax.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24245095969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cobra+kai+card+fighter+apkPDF 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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 10844 bytes
SHA-256: f2f4b88f2479fb505a91286f56e9dac220b64262f62a50b2da24ab0186d2dfb4
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1