Malicious PDF — malware analysis report

Static analysis result for SHA-256 588f472eace0a06f…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 06:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a45bd792e1284beb638dff75f24009b7 SHA-1: 5433df406e9ba26860fbd3670fee1f2ba775d1ab SHA-256: 588f472eace0a06fbccf1cb72746359ed823ba946b5d172970adb78fe2b271bf
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the ultimate destination. The PDF structure and embedded URLs indicate a phishing or redirection attempt, likely to deliver a secondary payload or lead users to a fraudulent site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077f8a986652---wolutetoxifewizasisok.pdf In PDF document text
    • https://gdaniec.com/upload/files/padawoma.pdfIn PDF document text
    • http://seamacros.com/upload/file/54323080771.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/wazewigiralanoxuvekut.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kse1u7cfp2gl4qjoemdb5r4jb3/mudegiwibiwu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc066ea74---sesaxigupefixigabi.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/pemididimawuvu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/6ab42359108d66bd9be4268c6c128416/99288698549.pdfIn PDF document text
    • http://palami.by/images/file/jefuramalinoxujunomol.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kanememadikebirutu.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/jebajazetegoliwofup.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ad8c188d396414e0b27da21c19504d51/59563300141.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210710070321.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/fenekitomifazekujazoko.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/soriwizabateputu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/150b9aee777d6f1e357978c142ed393b/dorotuwenavegawoxadisobo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19a95f6c8---werutuzibugikokewidoxum.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/20034141176.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb6c7b29b---tozawolubarusax.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/pifatep.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/458155208.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/36655443507.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/40464317062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+javascript+text+colorPDF 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_off0000c3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E4 19104 bytes
SHA-256: 603153134d7601f8a511f01882f08d6ccd1f817f8b26bf66a724fd71fbde66f6
font_01_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 10808 bytes
SHA-256: dab202d2bc5e0d223fd3dfd4733715c5dd3c35a4ab39c05ce0b864032efed675

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