Malicious PDF — malware analysis report

Static analysis result for SHA-256 4636acfa211e43fb…

MALICIOUS

PDF

99.9 KB Created: 2021-07-06 01:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59ab6e21dd6bfa5defb66bfb2ee1647e SHA-1: c53be01b315f4c8f40c140002db006007521ddc7 SHA-256: 4636acfa211e43fb40571b4dbf79a972d949baacadc3cb187d51d8071eaeb4db
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.0851

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ezastupitelstvo.sk/editor_uploads/system/files/41710653571.pdf In PDF document text
    • https://cmoretv.com/userfiles/20356488133.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b3ce9424d---1912267767.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/ed0tsr59l9g6c6g5r09gdftvgs/pewadusonopubalijivisuvij.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/45644232021.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/t4e9r6ub78548159hqpdsgjfnd/63326426203.pdfIn PDF document text
    • https://miet.hu/kepek/22323521744.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/58667734585.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459771d9b7---dileloba.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/88804666010.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/67511982707.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/53546096606.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2156e8893f60bdea6dcb431cf6639ca7/18507308687.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/26786069999.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/boxawebol.pdfIn PDF document text
    • https://tonitomov.com/picture/file/24191111455.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9d9ef8c6---35863596682.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffa83c66b5---povijezajulum.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/soseluwufezajabirekidona.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/31487903587.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/02865d5f7a1ef560918f8eeb41bc0469/76746945010.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/95137565212.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7nq0dt5allkqrgaa42sik5u3p3/81242240492.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b289d5be19---gegixux.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/7898917404.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/33843352106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=phrases+and+clauses+worksheet+with+answerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 10748 bytes
SHA-256: c85a4d8417d26d5e993d37aaf64780be0a093f9abf879db5bafa8cb6169bd8f7
font_01_sfnt_off00013df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 22828 bytes
SHA-256: 649d3e2e5da27e90aae2a02bc913ef93a3d15a1d60f522952ad77a5fef70c335
font_02_sfnt_off00017814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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