Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba880dc2ee71db9…

MALICIOUS

PDF

61.0 KB Created: 2021-09-07 09:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 375665f5eaec378112f0f655908130bd SHA-1: b81f83d62ab0b12b6854040bdde5101460b8cbd8 SHA-256: bba880dc2ee71db9441f18e2a528b57809ed8575feab02f54a2ace4189c7b315
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6539

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=informed+consent+in+research+ethics+pdf PDF link annotation
    • https://bulgariapools.com/contents//files/51985190931.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/rozedeposapotiji.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/09l6h0i913s8e34lhdut5qoe16/majutevotonupobize.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/xisixamotetipiwuweb.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/guzubijumidawezanefasufa.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/megurotalupubazewepufibi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3df406056b---95904385241.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1a811ed1e---57930998278.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/21106004480.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/81c590eb1410fe506e6e4ee5fd117ca6/vadujipotofewiz.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/12694626576.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/zamilofopuzed.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609268af7d4e6---kajulomavozezofiwu.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1e035528c85ccb111faca39a3d571584/9603415145.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/76569817637.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/sipefevebekadovezuveku.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b081aa8c---fivenuduwowajukakika.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/nazodirudiwotepumi.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/rulusasisowow.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8cc2cbd291d88c87c03259f65cc9bae9/refedororiz.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b666ca605f7---seragufavolexomuxir.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/pemututoverowuxewaruda.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/493f082d637246a11c73f5b0f7309f0e/36097635730.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5fg78ie9nv954i42tjcfmkg7n3/36594707671.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e47296249c---15347005936.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/wakuzezutegolo.pdfIn PDF document text

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