Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f2fb6a71b69758…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 02:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bc826ca7123b08bc1516a5a2570d7f9 SHA-1: 10812848a89ad14d36f305ced63dc7dd83afd0d7 SHA-256: 86f2fb6a71b69758d621cc1593246cf38dcce1feb9ee6060c8956b06922a114b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://garglob.ru/uplcv?utm_term=simdut+2019+pdf PDF link annotation
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/92ipsrm16a13po0o6h9q8idcjr/79529001620.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe20cc008---wukakugovedukepiji.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607163777ad2f---45617146938.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/mejosupobomobedivobabuno.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab0691dca---85408516274.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05ca69b32---mapofufipatoxomon.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27e3edffd---vekiwagojomevogagajekiwuv.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633165e5f3---dupowudugiwudezesevorawa.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/76829840508.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/86613160505.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160858a18e60d7---werebilo.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/nijonadinibeberesoxanum.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/70162454737.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1430c2f44a---87700556365.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e25b7e4dea---83595889056.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/50395585009.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/7totqbkbh0outthlectbempqh7/42641804932.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/xopusitotodulajefe.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/46585580343.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021624181404401.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/61336769759.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/sopitomexigewu.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/20311878341.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/40e951242412d4191f0e523de3496e6b/78427029665.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_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 18332 bytes
SHA-256: cc209813b0132b63ef1a14d9d9476eac04dc507930551d29e7ee4b11964d4f48
font_02_sfnt_off0001267e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 10464 bytes
SHA-256: 3b38725dafb849a3fff2a8354f330eee334015f3eda0b463ac0ed4d780b14bb7