Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bd8969583c73b1…

MALICIOUS

PDF

65.3 KB Created: 2021-06-13 09:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f446bff9fed9b84f88afd2c8b5e1ea79 SHA-1: 8dfd3bb16a39d618afbe6decd79f596d154ab0c4 SHA-256: d7bd8969583c73b11ded13200fdab3be0b0099316ae4d9defae7c378daec0795
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan delivery mechanism. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or download further payloads. The document body, though heavily obfuscated, appears to be a lure related to accounting principles and procedures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7605

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://synerhu.ru/uplcv?utm_term=accounting+principles+and+procedures+mcqs PDF link annotation
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f8bff63049---98030561394.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8650e6c1e---pegelasigimiwum.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/74272127585.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/i42vehkncfr1qu6h4kc66injov/12434415343.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57d8621e8---tunovukuxesotuvol.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a87b35daa39a88189de1f05b9fdaa133/15580573518.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073c0558968a---vufozigunudafune.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/2865293679.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/85524023851.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608421113ed7e---pakajumuwasorulel.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/efd9ac93eb14b6fe299aaf49856f254c/2574635448.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/69476953951.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4522f16b71a3be3ac8772f80b2bece07/63433438006.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m6jbh6ur48uu2d341uqj8af5o6/97208810160.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67aab1a79---70923379752.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7577b5b1---13766080831.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ad73cdae0---93077170789.pdfIn PDF document text

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