Malicious PDF — malware analysis report

Static analysis result for SHA-256 973b14817e6a13f0…

MALICIOUS

PDF

83.4 KB Created: 2021-06-17 15:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4b477e3505bdb92cea1876d7c723b302 SHA-1: 5e5bac8b49ceb415675e9adef9ffbfdcad46a512 SHA-256: 973b14817e6a13f09ad2c6421db07164468339d1c5923d153fa79f2e8a11c1ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are sufficient to infer a malicious link distribution attack.

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://lasanisports.com/files/nuzirebivunosajep.pdf In PDF document text
    • https://riondene.ch/img/uploads/file/nurozorasuximomezatasoban.pdfIn PDF document text
    • http://royalgroup.at/tmp/rojibit.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/22256852349.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/652a2bd73c281198725c84c1ed54c692/39489404045.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a40a7e08---boradoji.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/radebedabijobinakamone.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/1248178120.pdfIn PDF document text
    • http://alptw.com/images/files/vasukivurirawizezotubi.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/dazibikijet.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/minodojosu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210617181056199.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608784d12b1fd---91911393345.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/32b2fd470330b29a768ec59083bf2ed3/1573378729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=worship+songs+audioPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 5200 bytes
SHA-256: 224e8713d775667446d8cd46c9d1deeb4d75527b60eca77d4dad1f24532b7243
font_01_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 11620 bytes
SHA-256: 3275c6dfb2ce68d32d1d513b37981ee71c988d29e5679f7aa720b654269f03ab

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