Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8700b8cb798f181…

MALICIOUS

PDF

86.5 KB Created: 2021-07-17 11:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c2a82ac2b0c1a57ea306245a90f7a5e0 SHA-1: 15f28e8c005e60c1654e77089f00f133a2f3ca84 SHA-256: f8700b8cb798f181a96d01ed2c0194464995d1e91a7831d13c4bc5a7e22eb8a1
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised websites hosting further PDF files, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b618fc6064be3e30ebd1d8fcfb0af5aa/26068767773.pdf In PDF document text
    • http://grandrosso.com/js/upload/files/wipipekugonovatewaxeriju.pdfIn PDF document text
    • http://groupkaishan.com/d/files/69471606654.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c69f7a77a1bfdbaeac6946f0368ed67/rewawavapi.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/xebopowixeximudejenen.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b609d191b88---gijomatejefewovatizorij.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8otg6g0s10svr0rs67ts7dtt3c/zexufukenibuk.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607035844bb4b---litetaripa.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/42393369787.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b0597a19521---bodimip.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/21975481794.pdfIn PDF document text
    • http://tw-go.org/files/39740475723.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/55384122887.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/12812665268.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a4213e01ac55c48299241b6ebe80374a/vopuputejiteso.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b7445536---13322538870.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5368428b82138d0502cd371a5dccd077/2262973173.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ajk1lbeqs74oovqprnmbgogno5/sezuruderusutawaxok.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0bcdd283355cfdfc6606f0a8aad3b632/28400520540.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jshrden8dlscvcn3degb3c58l2/64038056383.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/96602382988.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/31847655174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=who+wrote+the+song+both+sides+nowPDF 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_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 10536 bytes
SHA-256: be27835c462b848c52abfb695f51cace0d09392c6a352a1b2f8a115639416655
font_02_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 17816 bytes
SHA-256: 477e3d02fef454c9f90f11dd4788a508ac1ceeb44e102873513f8e8ce40fe246

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