Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5db55746c8f4000…

MALICIOUS

PDF

85.5 KB Created: 2021-07-16 06:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80f11001249ffae8bee476bd3e4c2d25 SHA-1: fbacaa0a10667ed0dfd4aca149f851318f329cc0 SHA-256: a5db55746c8f4000347a32d388eb609191dcd7fe4319e77e7b9bf4458ca6bb50
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used for phishing or distributing further malicious content. The presence of these links suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=cool+face+scar PDF link annotation
    • https://marblobathware.ph/app/webroot/img/files/fewifisexejiren.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/njr5fjakf0l7ve5pn4eas2fgoo/xodipusesivolozejawiwi.pdfIn PDF document text
    • http://feng-shuiworld.com/userfiles/file/ravigi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608632bbaa793---35789287418.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/751d8674c531b99c3df435e835eef482/8451172856.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5686003af4a892ea92e3a5be3d6b1fc2/59738366423.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/6c86259484f9281085a9801721b09d9a/luwasez.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0hmom8m8neg9rh4oj2nremmb54/61482542577.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/68886453820.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c774209d6e2---20456977472.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/e1sib6h4afangdp6ln4fvucoos/86670386470.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/85173242778.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/mezibaw.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/n2msr661v6oouo67d63hodpps7/sojugijafesaduwekapezowis.pdfIn PDF document text
    • https://equinox-e.com/upload/files/jojivepadasopi.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/fotesujiguripube.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/82145603430.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609869d6ed8c9---pabenupizinepenusireno.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/kilebo.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_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 10064 bytes
SHA-256: 8ca781c3b12c6290403ec1b03b61f93f415ad20da444f189a023d63bf48ae1ab
font_01_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 17040 bytes
SHA-256: 85b7b7bc9495fd3d9ee0859234ea96388c4d2cf0da887b0372bdd426f5a5ca9b

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