Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c8a892186fdccd…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 05:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 826074c9c2165dd3ef8af21a59be97ec SHA-1: f4db903e5b935a17c184adfd9475a3ef325adb64 SHA-256: a5c8a892186fdccd708a3fc865a21ac7cfdc512f4d6ffa471d1eb2b59d3ea98a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to facilitate initial access via spearphishing.

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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609491b9be197---fovarut.pdf In PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/fd85b5e173c60a4a0c5608d87fa6cd55/75112865712.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4ee8e91b90bcabd6c62fad2744829481/45381304892.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088244e88151---41703472906.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/latokagozegamu.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/52180925808.pdfIn PDF document text
    • http://hainfelderteich.at/wagaxivozogijodewinejevek.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608633fbc6e6f---faxaneruvinofagukanamosil.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8fbqc5npbr21qkm8j32pi676je/jilebijemulugepajo.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/333160672.pdfIn PDF document text
    • https://tigapilar.com/upload/files/midodixisivip.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/15337b43e5a94ff4c87f100feaeb6979/54877685851.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4515175396---zifidafesafaradolag.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/xoleborimexegodifekas.pdfIn PDF document text
    • https://argumentua.com/i/file/fujuzofefokevil.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/79fc3bdc2dad46dca3ee72bfab96bd17/gufunuxisim.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/nigerota.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/sasumibixizan.pdfIn PDF document text
    • https://grancom.by/upload/docs/86832395778.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/46360763759.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811513eb5da---30788961066.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pirikunediwefogot.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160dc75ee87473---vigapobafife.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/87229554152.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/97451251575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=multi+step+problem+solving+4th+grade+worksheetsPDF 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_off0000c34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34A 11392 bytes
SHA-256: c02c05294282d5a56786b1e665460f0b70f67153202d32635055b0819571d554
font_01_sfnt_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 16016 bytes
SHA-256: a01dde18bb6f759756e8b4d80764a101d9d26ee6574f4c506a96f695338daa22

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