Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a121201f236708…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 09:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89e5f698e36fa6b7dc6cf9b5e71fdb7e SHA-1: e5f70f4ea3298f193d86266056eb553ffb6e7350 SHA-256: a3a121201f2367080749c972aaa53d3202221af5ad7154d0b9df838892862769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators points to a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=apk+on+iphone PDF link annotation
    • https://promenade-perpignan.com/userfiles/file/8883684022.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f236405cde---82476563091.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/b0bf43ea237661c275af3e06fd094187.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/31426495040.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210903_075332.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/3556310945.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/76369030660.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f82790c4df51744c3ab7c9ddb4fc8131/fawisasodazupono.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/zepejijolixiwut.pdfIn PDF document text
    • https://digireg.ch/upload/debaxesakererotolevepada.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/bowekemosolusa.pdfIn PDF document text
    • http://thongthien.vn/upload/files/46260463241.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/lilikolipuropinuxegune.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/sujugegajamovekomalajotip.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/rifenugevaxirapoje.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/pipunejok.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/40589803068.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/75350396576.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/870bba62fe06e1fd64d7dd8f1970646e/vagudazoxodew.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090908031373499.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/gugosiwuk.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3db0c327eae0fe5659906fb2bded1edc/80144204800.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/16120199726.pdfIn PDF document text
    • http://heizler.hu/files/file/jegoxipiladexulefugufowe.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_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 9848 bytes
SHA-256: 471e7e276a3f1c06895ec7bf5f347898f8832d4c30b841a49e6bf04d0a140bae
font_02_sfnt_off000118fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 18220 bytes
SHA-256: 81965a0fa7a1baa7a93b6f4cc4266521758d38d785e4d512056e67725909e34b