Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27cf27306233642…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 23:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0df91aad8f246031a302a2f2b2f13a84 SHA-1: 53e9d02bc52d4fd265a055ff92a4748193a601e8 SHA-256: b27cf27306233642dbdc3c9cd1246f823db1dc048ff291e9af34ca01d23dba9c
154 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8388

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://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/87sfnmaolh8si6891l4gisbb67/7205918135.pdf In PDF document text
    • http://trustarshida.co/cache/fck_files/file/loduvubosafumow.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/banizid.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/90164474219.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/jifelojufisijuwuduvo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8353400eab4e3fdd4a59f3a6451f114/66710534459.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af4a105d60---31502834914.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zujabanefipojemubo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e67a0e069---zojejebetopugol.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/taxepuwebag.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160851e53695d0---bafunojubopanidelenajemel.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/c8sqvji4cphnunai60q28psrtm/65604309538.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/28136086354.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/gopafowuwuwuf.pdfIn PDF document text
    • http://maxbrio.kr/files/files/xatetukozevegobemixerew.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/92524042709.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/50299775061.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b5b1cb372683e87d1c875a26ace65d2d/sudufogazuxalakafoved.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1e7719ed552b2925d39093b55fd2f8d3/32591056486.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/74075119923.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5jqa57vqjgqo9tb86gck9o8l58/bisovabusurinopivunowuf.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/jerasivejujipi.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/41127643166.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5308f4ce2efb2c011ff0875605d81562/wegejesasejuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=places+to+visit+in+manchester+nhPDF 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_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 17260 bytes
SHA-256: 48df578333c6087c9d36ff80fd34ea1259aa5fc890f1907de2b695be3906d562
font_01_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 10564 bytes
SHA-256: 041cf3debdd3fd2b994c6243c41e0f1dcf6a7c0dbaeb4c402e442599e4066406