Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76cf73159b64e5b…

MALICIOUS

PDF

91.1 KB Created: 2021-09-06 19:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6960776ae63a69b3ec8b4baec3747234 SHA-1: 21ef46fcbfd6b3d97c5e308fab34ece041afaa56 SHA-256: a76cf73159b64e5b033bea696900099a83ecec036c93df651521b041c989acbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://nomylo.ru/uplcv?utm_term=behavioral+science+in+medicine+pdf PDF link annotation
    • https://mannoorpally.com/uploads/file/73242180536.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd065f6fe---48053157224.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7f539540---51810435767.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ml2i664ci61rf7tb8h27v0d75p/95200818723.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b47efbd9efc---pelenijefav.pdfIn PDF document text
    • https://rcot.org/userfiles/file/susudemulexudopefugor.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073c28458ebb---tamixikikamizurobax.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab36ecc95---misuxe.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2bd1a58106cfae1683d5051038545fe8/databufedobibeza.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161188e2ce0ccc---sexajukobober.pdfIn PDF document text
    • http://master-vin.ru/files/file/waxurinewe.pdfIn PDF document text
    • https://akconta.com/uploads/files/bavefibululibumijagivori.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5223371a5---37485291082.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/654f6ead7b7f74803340af35d6f04dbb/80600284866.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/29615149178.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/sm42v8f4o1v5apg5j5nt5q4al2/mefetudukexetesuwekeduse.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210628050125.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/64b898e071be9b9172a62ddcd43cea81/21890338508.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109b14de2ab6---92576570679.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/degovi.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/80560152264.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/judososu.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/misufozuleganoda.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_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 10908 bytes
SHA-256: f9c284e402c75e37a914ee8fb360ac2908750046a6d401e746287d37516c57b6
font_01_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 17832 bytes
SHA-256: 52ad15f85239c94d3c754ab679187808aab3089e23459f75b6e4e907c4448273
font_02_sfnt_off00014651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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