Malicious PDF — malware analysis report

Static analysis result for SHA-256 5892c8d770917324…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 15:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1572f97c5bae60b3fc047a451ab7ea3 SHA-1: 64a3152cfd28883f07f0ef7e601ad3a4d7a277e2 SHA-256: 5892c8d770917324b04f17f88cc542bd4346864d3716310dc6dd94749b2a1899
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=pirates+schedule+2019+pdf PDF link annotation
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8daae6c831---munogeja.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3aa458de8e---xalubo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2771c014---sowuzugorinojilul.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/41506902644.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160916db554cc7---95529756805.pdfIn PDF document text
    • https://aneri12.eu/res/file/78218483065.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6048dd3983---51274119984.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210905084428771358.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/74ccae90a07e8cfe82cbb88a780b0abd/55891987707.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/3675167183.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/q9alkcsg51t2ve0983t7skg2b1/tedume.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/rididuxubagoduvevasu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a63136a5790753f55215000412b4c822/sevulisom.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160809e2544a46---gabose.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/58164684414.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/xidetomakewenojive.pdfIn PDF document text
    • https://wildnaturetravel.com/File/87253946388.pdfIn PDF document text
    • http://mousike.it/img_ins/files/65048877862.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/86028304465.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e600e775e5f4c7689f0405cd20a818dd/42895619463.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d56219722---19494802151.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2d0633a3---63369887280.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/tipaxemi.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/jopodanozesaw.pdfIn PDF document text
    • https://discoverthesky.it/file/76168942031.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_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 16080 bytes
SHA-256: 885b727cd02be1036111d307d53291b7721bd30183bf82da1a9faca7528fde6f
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 11056 bytes
SHA-256: fff2c660225faf32431cdbc3c939166495578f5e0177bab8018228e89bdb0729