Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4f84232e7c712d…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 13:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb747cf419e679ff304de11513528541 SHA-1: c82025a04742ae45e38ef0e16652fcb51a6187eb SHA-256: 4b4f84232e7c712d16fc64d3b734a854c3318d5dbda41e9c9cc7aa50acc260da
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The 'SE_CLICKFIX' heuristic indicates the document employs social engineering to trick users into running commands, likely to download and execute a second-stage payload. The embedded URLs suggest a link farm hosted on compromised WordPress sites, potentially used for distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://queure.ru/uplcv?utm_term=turn+off+automatic+driver+updates+windows+10
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a69192f23---donofeloza.pdf
    • https://foundryindia.org/userfiles/file/70518283891.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b757239f---72288101121.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6202b125d---valedudazowibo.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/3af45f48c96bb03321f2425169d4422c/jogeze.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/wewizona.pdf
    • http://eltonltd.ru/sites/default/files/uploads/mepuwedadavoxipof.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9106eba38c---47050603986.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/benemijex.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9e6cf53f48e31c0824dc52160636f42/paroko.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5dnanrgj6tta6ek394n5q8id7/82208982848.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160723dbcbe22e---gekivakewasabog.pdf
    • https://amd-export.com/site/upload/file/61484913789.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/78r2051k6kbujqo55kesh3s6t8/18433760984.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a260b81aa4c---suduxidumatip.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/poh78fn58n65i6jrgf8rt6g6o3/26673791562.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2123436acik97qo4o97u353krs/37504970548.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e48ae851e---rogodegoxuvoxebip.pdf
    • http://brmxn.com/userfiles/file/20210520021730_vntwx0.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607671bcb38e4---19857405914.pdf
    • http://rocb-ap.org/file_media/file_image/file/83654970181.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/70ed56b544952b2fdf20349d105fc2d2/mifonafatofug.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609032c2a6e24---vinuzo.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9c7b2678d3652a6c159bf3d5e5103dfd/3112990696.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f865.bin
dd28ca94ef3ca7b8fc8dd0e0fb05682b0e1355d9f466252d638f9535f45f6157		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 11124 bytes
font_01_sfnt_off0001127e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 16792 bytes
font_02_sfnt_off00012a90.bin
cf1a419f0da2221d301b32d2bc9c17129f3a015ac21dc9e8e76a8dd3db15fbdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A90 17180 bytes

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