Malicious PDF — malware analysis report

Static analysis result for SHA-256 210a571fdb45ac74…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 00:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ff309f8ac81847db599dab76675ef7f SHA-1: a48c7f81e08b6d79b712f20c6d84be2f6d9c0d17 SHA-256: 210a571fdb45ac74bfd243eac53f856a0be7c212afaad3d177a467764aaecf8c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous links, many pointing to compromised websites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=interior+design+detail+drawings+pdf PDF link annotation
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/jufojunisapuvafibolali.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427030d440---19893005915.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8ab48d48---worekefuvewara.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/mupewasinetejone.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/81771201790.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/80265091344.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/29593835348.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210828_8F987E44C8EDF401.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/vijolibawizurimis.pdfIn PDF document text
    • http://dges.in/userfiles/file/63424559934.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/xelugijutewu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161173cfc27af8---98504148334.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/20451581623.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/gufolinu.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/40958444559.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/91436022528.pdfIn PDF document text
    • http://garderoba.sk/images/_file/74861469253.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798cdb6ad3a---rekenimode.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6780f5858863cd8d92a9b71934801459/tokowi.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/1714189558.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607113c784d80---15041091054.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fecbbd2c3---texawo.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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 10708 bytes
SHA-256: 5745c24899dccf4755bae95c656ac2ea69635ab123e7779c92e2ef7c9e132e95
font_02_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 17224 bytes
SHA-256: cac982f2d47fa7dc0aebaf5e7af15f0e296226c6b92fc3684eec594518bc5908

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