Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d3b6d31369618c…

MALICIOUS

PDF

42.2 KB Created: 2021-07-18 11:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 254ba685876e4376c211fb99d8ac231c SHA-1: 110edb56795e093a240b367c968bc37b9f35bc9b SHA-256: 77d3b6d31369618c850eb58fdff75c1253ff42cc796c7257aab790f45c650fd0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The PDF employs an image-only lure, a common tactic to disguise clickable links that lead to external sites. Several URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7092

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/94e287c05fec3ea5798132f62d78c2be/soluzuwibaduxunase.pdf In PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/tegalajuxage.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075782f89d2e---vowapofisagibozefix.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80d7249a8---34453222905.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c4a8f1cb7ee27219adb1a26b00147bc6/naguxewegujarezulo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/65671306292.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2645065827.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839dc57d134---41843581449.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/kufedal.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e716b827---kitezuledonafifale.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/18501113386.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/vugesuj.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7e0aa1fa5---fovanizugaxefamoseze.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ff3d87316686e208b3a5414ebc84f39c/62907057931.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f83b6b8e19---59875410225.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cbbc0da4311591c766503767c5199de7/besesitosufuve.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8rdctaaeje9okkcptvqrb43au4/jovepevuravovelaxo.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/bilewupozixuzanirom.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/94a0b2bf8f86ceb683c7b4d046d8f0ee/71907803001.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee684f511---fazutikiz.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73df4c82c---38414278093.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/benefujuvidit.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16072c776c0c27---74494877858.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/dot855o589103ep0r921qstkua/fufejamopowobekex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=topology+through+inquiry+pdfPDF link annotation