Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2e52ebc4951b37…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 02:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85c34282f3b9551218ceb61917d7bf8e SHA-1: f72ed69d858addd664fb9fcbebc5835b0c619948 SHA-256: 4f2e52ebc4951b3739eee90877f665bd8f02561709a8711bad41a5b724cb56d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external URIs and link farms pointing to potentially compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF likely serves as a lure to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=change+text+in+pdf+online PDF link annotation
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/piguguma.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/63nlktej8aaedo5mheelg9ltml/boxufenanaperafojabirax.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/vanagidekale.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/58aa3a405b1192a95fc35b6d1950de3b/xetukagefilogabopi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/93fd4d3123e4b3decfb32570d5ba62da/76404953734.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/bozabovefebipufufin.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/12499091067.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/39m30cc67c68u0frrcc4qq76b0/mefipuminuzabemapulujevet.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/lavubokanamedafufow.pdfIn PDF document text
    • http://prestopc.it/upload/file/25872616460.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6062e7451c2db006c8ce26330e68f3a2/putote.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/82568353222.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/8394266472.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/26163569226.pdfIn PDF document text
    • http://industrialdevices.in/uploads/savopewe.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/zululomovuk.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f4b1ce6209e844ee8ccfa68dbdbf8f91/tubuvilamurunagogaga.pdfIn PDF document text
    • http://e-hane.com/files/53485093416.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/zatosugisuruw.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/91658995278.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8be477920c6a581f6833d6825db5c570/786413026.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/a1084e7a45da63a00da1efd3c7e3ca9e/zafadidug.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7092210be---61624632317.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/bodaruzisa.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609daec9bbff4---finivowoxuzavoxekojufoxo.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_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 18148 bytes
SHA-256: 01c058da6affb0c9368ef3fdc54ad0ba259aa04822c645bb36bc4395e815aa81
font_01_sfnt_off00011a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5D 10644 bytes
SHA-256: 412423c8d2e212e307ff70d4ddb7dc9382ebce500d222a90a54ee76cf03bcc5e
font_02_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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