Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ca1a1c46fd842f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-14 03:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44d434841440bead0ec092e7ca92df42 SHA-1: 207f838cb1ed06dc999e329e9aded82672e648a5 SHA-256: 37ca1a1c46fd842f16c142c14e6a94aec6187da8688a619a5433f00c4f5249b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or distributing further malware. The `utm_term` parameter in one URL indicates a potential SEO poisoning tactic to lure victims searching for specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=accounting+principles+9th+edition+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b417b41017---furofukegi.pdfIn PDF document text
    • http://valeneighbors.com/userimages/rizabaral.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/nupupidusog.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/livexalulonaponegapiluja.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/sosawonoroteroxovutekas.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f99d65fc7d---taroziniwepetuxozag.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/bigopunafubowipax.pdfIn PDF document text
    • http://mq-water.net/upload/70364429019.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/subimotuxumowesan.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613141180b57b---90352018730.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/kigira.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/33264349633.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/77687658269.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021913_224938_940.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908091546.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/88065155145.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/texokisebomozanuj.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/fimigalefedawetikebesabax.pdfIn PDF document text
    • https://hoalavender.net/upload/files/1670661479.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/75754166169.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/jataw.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131baea24cb6---1588551777.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/28733369696.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/68624605278.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_off0000b43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43D 10984 bytes
SHA-256: a615a0ca074e4d66b824b5d6d3c9c13d0ab02d431f03526043d63c1d48e3d2a5
font_01_sfnt_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 16496 bytes
SHA-256: 10fa63e57fd743a0e7a35154c183da9472f59f1a1995193b7d369bd4f88b18b1
font_02_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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