Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af1a8bc9d10a467…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 03:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edea6e6c02f4934cc17f0cc0706abb90 SHA-1: ba17ded8302fe7f21c282c2dc2d5487a35ed97a8 SHA-256: 8af1a8bc9d10a467d6191f89ff784521f3ff7b88ab9b87996bc3f82d6308d98a
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Several heuristics indicate the PDF is part of a link farm, directing users to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://petek.biz/resimler/files/rufirafosa.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tk8krhpc65er5jp90qffnaece3/wagula.pdfIn PDF document text
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/96266949035.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/mogusasoboteposa.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/74821784461.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/futisamuxezosin.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/junifevopomenaraxomirofi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5ba8f7c8953178afb1ac9e819b395cb2/givonikijilexot.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9a56a1a734a1b04375398d60d74be9be/26237879930.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/15583787345.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1626213931.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/d760fc2b1f95e7d61f58d8766d9c4351/nejowi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccedb1ae03---vuxigezo.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/nuwof.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210726071128286.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/debimerimenuzetuk.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/vuxelureneboserobisavef.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/27673509683.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/zuxanabaxikorubimi.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/95763622320.pdfIn PDF document text
    • http://promador.pl/userfiles/file/kuvafagotil.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7777j0bgon8i19ogo2bqttensp/fumixigemalogovewo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4885e64f169958ad1e8b0543a9efe09d/80125198971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=business+english+intermediate+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076142a7c80b---50432198685.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_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 17124 bytes
SHA-256: e19c604aab490d4a464a8454446ea9949005c8773f9b5227f3cb307f44ae7eac
font_01_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10980 bytes
SHA-256: 65075f4b6ff640bb20e551d24463fddd179ac139605a5f35ef3c8fb2934f5d86
font_02_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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