Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f6d1ef6d2a30e4…

MALICIOUS

PDF

77.7 KB Created: 2021-06-15 10:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a058e1abb70490b991138e8adbb5d168 SHA-1: 3589928dfa3fd5de0baf1c5c5001c5b3437bf844 SHA-256: 13f6d1ef6d2a30e4f09427e02312f8e1361f0fed2238c899488b9247568b79c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=dpst+switch+symbol PDF link annotation
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8d79500c1---85096215525.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a3fe73d64da838635d4c27e705fffb6d/jiliduzavoxuzenorenudutas.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc7ae51c5---sobenoxenirorag.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da372cce7e---mugipegerozilo.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a126db8eb092168fc60cf8538b1213d9/83453955062.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9c4fe19f48ee904e8990dcefb78676a0/piruliraburososaronug.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/60c5707573fc018cc526b95a7be91708/65389650587.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/45258557309.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/96539674301.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3ab5f1927cbcb56a3cc8fd13407ace07/99258309752.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/munerira.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbbc6dcc0---javajonewu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ida33vopsmche5a7v14tqhbd1j/dosurolapamuma.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2e690f9a4d8d94a8b27e10f6082b8f36/55802169255.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c45fc73c9---963275081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 4764 bytes
SHA-256: 8541acf9912cde44e5b018e7ff3aa3f24568c5fd8360f281ed1ecd7f0d971cc0
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 10360 bytes
SHA-256: 83cafe4634f997eeb5ab4c1152aff9d1fd0cac47868492e52c31cc67b807c117
font_02_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176