Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3db1befba40adb4…

MALICIOUS

PDF

68.4 KB Created: 2021-08-06 20:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bce0724096d9de18494b0b6aee5a8d48 SHA-1: 95594eb092460dbd7d627aef00681f86cfe91e24 SHA-256: c3db1befba40adb4d997d26379c9400e52f289095b85d3b86a7d24fea0aa4462
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and links to compromised CMS uploads suggests a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8460

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 http://hiddenforrest.net/clients/76790/File/63071502779.pdf In PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a00b20223a5---95738838659.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e546d681---bafaleluna.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608443c775d58---dekuzimoligavinexib.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/59844463887.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/316efaf9b0b471ffc43f9cc4b9d38c61/55763805840.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210804063539.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/gamibatikuvobobuz.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/96429720567.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/bomobivosizukevewimewari.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/lajugig.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/xevojiwa.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/64245348237.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o40eb2batnr1c0vjhte9oackn1/700197254.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gg9gpai710265ea3b0js99au2h/kijudigok.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/98441686779.pdfIn PDF document text
    • https://medius.sk/userfiles/file/vagofipiwil.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/l34palreriiek34fj03nldrd67/jawoxunekokusabofibewuzuv.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/no8qb8st4f0g3lhs39k10r7j50/89679762525.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/15087645581.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b37f00e2---49904286097.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///32292181081.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/1ee77971891b29af87851bd78eb8abf8/89855776900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=personal+swot+analysis+examples+for+studentsPDF link annotation
    • 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_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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