Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd8603f7fb3f478…

MALICIOUS

PDF

74.9 KB Created: 2021-08-30 13:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 960ac19ac374192fba0fac22305363f8 SHA-1: 6c40f21f75e2d51e0ad40e1a43f3fb8229bbe22b SHA-256: 3bd8603f7fb3f478289814f62383c459b8dcf581466093ff6ffc944aa2355618
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. It contains a large number of embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://queure.ru/uplcv?utm_term=10+grams+to+cups PDF link annotation
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0dec9d4101---13466905693.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161115176c066d---wedare.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/debapebepex.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/16757887253.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/xununewunumejabazupum.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd62845fd7---kexarezofelejarozinetiji.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16103f5a4da050---57358137795.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c84964b75f2237d36ab1f719c39d42ad/80319340873.pdfIn PDF document text
    • https://pindimana.in/uploads/file/27110992396.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/nntlu39mirbavpj2d0efb8ooqp/larujavirozipefizedinizow.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/tegavavikolilunoni.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/najonuri.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210713135229.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610be145dedec---ruzaponomomav.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c372811990da1216be9f1eec902442e6/dajole.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5df8147779---xusez.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/pametesu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e149e4eaf3cf14b0c3d7b4ab1fb760c3/wapebivozoligadurogubogak.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ff27fin39uqihglm1qvspuetn6/96924137779.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f86cf45f428---lumukab.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608423cdb7e04---vufowulakuwebaguvigirigo.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/23172294925.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/73056926296.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8f6cce6c7dd8f6adcefa61b08578b05f/bimujozelo.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_off0000c4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 10520 bytes
SHA-256: efec4b3b50eee6cbffaf3d65ccc052e1a21707b945862f489d1eaa5403ccd2a9
font_02_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16224 bytes
SHA-256: 414cc94df689e515b0600f552126a89dbfd046acd856a9f92c2fcd09cb31bce4