Malicious PDF — malware analysis report

Static analysis result for SHA-256 20709f4c9c10f38c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 04:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 457398ba49e3ee603213b63a9234a861 SHA-1: 3e0e903b2689e908a0b2701ac0ade4b74e4c9dfd SHA-256: 20709f4c9c10f38c71ffbaf719d2bd5094cf0d9d1a631c11772c5b8fe7f3c52f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to external malicious content. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://bkht.vn/userfiles/file/16300125033.pdf In PDF document text
    • http://espwireless.net/uploads/file/dogoruvuwinezovifafijasu.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/98233113515.pdfIn PDF document text
    • https://rm-parketi.si/uploads/nexisovoperasowolorutogo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/31e6cb59ac7b032a59fd3a2e1942a534/fodezawuxasof.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16130e02126953---48528194117.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/5826693182.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9eb66df1---51185915679.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/zukexu.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/11443264055.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/69516794856.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/600413bb3521bde96a06f0058199e76b/zajawapeli.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/vezezarulapapesuju.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9a011637a5f592b88a1112929ec0cc30/75414189883.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/sutexemafuzurusemoruwipaw.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/mazob.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210913051800.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/ruwapemenasimo.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/73035988348.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/99345617540.pdfIn PDF document text
    • http://status.cz/UserFiles/File/46704952853.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-16/20210916124641646253.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/pevesutulepokememugefo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1f28c991dc2ed924576c1fb4c98eeaf5/puxapazenexanomalagag.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/54710936296.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/54bm2i7gsvu0h5264bp4m58cqs/begezinamevegera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=secret+message+app+androidPDF 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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 18368 bytes
SHA-256: 2e066817102dff0eacdb7ff612dc2256fe3de46fb3b8daf5824cdb9b99a901f6
font_01_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B97 10888 bytes
SHA-256: 2423b4703e1074a0c46b0856438688365a093cba76b3cf1bc947d971823fef37

Open this report in the interactive analyzer, or submit your own file for analysis.