Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0ecfba1a6934b4…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 04:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9861cd1cb904004f3b3749f6b383ec70 SHA-1: a8991ba66e9fad3f69e3be26e38396863393b507 SHA-256: 7d0ecfba1a6934b4d581c54d0807e124707294aef75512e24c3c32a3f46f1049
244 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious Link T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. Heuristics indicate a social engineering attack designed to lure the user into executing commands via the clipboard, consistent with ClickFix tactics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://muahohangnhat.com/app/webroot/uploads/files/rimanubominepesi.pdf In PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/qehfv5fi7b53jj7u7ef1rmgi8f/56526146536.pdfIn PDF document text
    • https://kham.vn/userfiles/file/limelu.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/73320005955.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/lufowuseki.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606dde7fe8cf3---mavulefagiliwiribig.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3d4h7n202n7qmm7gbfl36345m3/93471813455.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qcj2gdj12956cjvk93faupojq1/10626510064.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/76010657500.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f96ea0e7ec---72229719474.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/venetujise.pdfIn PDF document text
    • https://orsolyajuhasz.com/ckfinder/userfiles/files/nusiluwedadozol.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2a4fph9ah42t9pcjmc3hk5ig80/93086013825.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/2e8n40u7bt7qfg7qdurtlgbhlo/rakanevuse.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/25636356551.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/pilakoge.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/77409659594.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/21ae84fd2b28370551f9b8d11a3e37cb/46986859741.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/jinuderedorizone.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a171d036cbc---39214515444.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/sn2ph5p4dvnb77ud2m5n8ikbqi/nejusebabubugimor.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/usfreipek6mnp1tjr68kfsc4rc/vuwudogax.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/nizuwepemumuj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d89322c9c---22224175265.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b641ecc29f7---67441701348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=windows+7+factory+reset+without+passwordPDF 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_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 11016 bytes
SHA-256: 965bea130558f375c0e3ee7b14d319cee2f28a7aa465f8c1472de8950bf7d281
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 17032 bytes
SHA-256: be89ed0181bdd7ae123d26d1ab8b141ecb6eceba139677334e87c64b10bc9db9
font_02_sfnt_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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