Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea94f7819680df91…

MALICIOUS

PDF

80.8 KB Created: 2021-06-27 12:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 318177b9df774bf153e4ca99069d9e93 SHA-1: 11f69d9f35c4662f0b7d0407d12c4c305aa1cc21 SHA-256: ea94f7819680df91d1708db4d5fa6c835e1f8a8bf8e9ed945554c157b3729ea2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=what+does+imo+stand+for PDF link annotation
    • http://brilspa.ro/userfiles/file///norilo.pdfIn PDF document text
    • https://dpmceramiche.it/file/52017539807.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/wugapujibanuvefur.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d46caa94ade---66267187708.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2cf717b0f---loteraz.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7056750424.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9c3dc10d27bddf1c459bc62328098e6e/talesadexozawijotur.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/65618905902.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec62ca7b8---xufasor.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a5a7c6b675ea62da4b34d32ac81832dd/depomuvaposenatodi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2fa04441---tolidiwedinutowetepigu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3ef49617ea1413600c79368c5af0e421/wajasokepe.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bf4e646b0323ecf0c8290eb1c773679a/dobewerozatewejet.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ce01862dca8c99419bb5ea3a70a82fab/kewobininixidojow.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/316e27f4ed476cb23b0a2da5fad11bcd/92208675195.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4450993d2---80554936750.pdfIn PDF document text
    • http://01host.ru/userfiles/files/1554544363.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/73862787065.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b63a14c81---mosara.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecde78bc26---77510520115.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/36920246978.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e0ff036dce8822784c771bd95156821/zofewufugat.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e60a121c5---51945335869.pdfIn PDF document text
    • 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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 17920 bytes
SHA-256: 867d8056d1129662c3baaec6c2b5b21ed0e34248a60bd7e6642b582c837fe6ca
font_01_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 10564 bytes
SHA-256: e8a0cf0443c6c7b8fbd9f1701e159bf46ab818b3d5b15a5a7ce92c20e38d1be9
font_02_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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