Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9502258223604c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 12:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca81adad16a3212f89950adb286ae753 SHA-1: 332f5181a7b0484cd74a09ebd29c018a0771bd93 SHA-256: cf9502258223604c7da0a228d010bd099aba1a67696a8c156edf1b1364304abe
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress sites, which likely serve as a distribution point for phishing or malware. The document body is unreadable, but the heuristics and URLs strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9db4ac746---97822134958.pdf In PDF document text
    • http://placc.info/up_image/wixatigatavep.pdfIn PDF document text
    • https://okvino.it/file/1469158239.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f248d7d0c33340d7a70b38abf0cb9eae/987822972.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc8f8da18---jurupugodutevaxijibusag.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051912531673499.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160838ca35ca07---7185829599.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iq3uv6023dm18qdqourph7tn50/35994452153.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4818be331ab8de7f9be72f9f42dab01/dubukajibave.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb3890a2b---51961485120.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/40410608597.pdfIn PDF document text
    • http://cpils.com/userfiles/file/wuvedi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b81b2cdc---biputososesozizu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/922e9d80a1968ffeb6cced51d2893654/renebutasubapi.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/fumuwomuj.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/xutezepezejosodajibifa.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/21829308912.pdfIn PDF document text
    • https://artenika.pl/fck/file/96109969750.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/l9sr4o7au4h0gl1ho72oid5euh/83394055404.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/rifujuv.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/170aeb8ed242c95e3d0a6d9d19ca255d/21487158953.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/94399931003.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/kesawasojonudovumovuravi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bolzano+mappa+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 17880 bytes
SHA-256: efd2f038a468111b29eb7c3ec0c647f93ed07244b876aebd7a9c1c682eb1efc9
font_01_sfnt_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 10184 bytes
SHA-256: f867a7018dfb53565388d4a1e1e56ae02cd8ff9c60dd97cae674355e9e759fea

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