Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83eb72b85aed2a8…

MALICIOUS

PDF

108.2 KB Created: 2021-06-26 14:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 325f368c119a5f419804eecbc52a6601 SHA-1: b78e858164c9c01916d928ad7496153dcc3e5811 SHA-256: a83eb72b85aed2a834c785e6ac012b56e06c05145da0a17bbd8d68d6ae4606a2
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature, with the embedded JavaScript likely serving to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efb1e24dbb---sabidotovogiki.pdf In PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/afc3358cc282c816fe080cd660ec1d8c/98397573883.pdfIn PDF document text
    • http://chikatere.com/Upload/files/59821037677.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/wofoxezorar.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2f830ac5db96ca6801da7562e1ff826d/danorawi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/witexuwajat.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087183d01463---78599670224.pdfIn PDF document text
    • http://ashioke.com/images/library/File/tatajonezosalemonerobesa.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/21458113967.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/ruzanixozejetize.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/27280968776.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5so1eq52nm7d028i4dsm2pcm40/nenumolalu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cfdcc07167c04276698c894d0234645d/15161394595.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/69635975861.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909dd87cdb3---suximeduvukufene.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/13276389003.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a4b8341360b6f3438866cab05e357d75/84583442455.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aba610755---39915315974.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93c93f4be---64579509498.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/0k099sft995qehv764khuom27q/98480807873.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160934832f28c6---93630936854.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5d36082b---sojezesigikoki.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5358feb5fa---69120716613.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ca231b45---xefabopetejiropupozidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nuclear+weapon+design+pdfPDF 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_off000146b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECF 10860 bytes
SHA-256: c19b57666b95f4b29fbe9d7763b2716df1893152c2e90d1651e7d98f6b0b2f07
font_02_sfnt_off000177d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D6 16872 bytes
SHA-256: 955404c7a18c47966fccb126e046840160f8a6416b8283bd0f9d80ce93e916b4

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