Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ea7229f7f44e14…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 23:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7192eacbd11f43cbbbf2833c60dae9e SHA-1: 9acbafcc410baddcaf75ab785421e46975792ecf SHA-256: 08ea7229f7f44e14994d95db79e2a9f0a5859d298ea19b486e6d1de6871b6b67
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=basic+civil+engineering+interview+questions+pdf PDF link annotation
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/72b1974e44de71eb3da7de556837e65b/58788920142.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wosexapofemotunokexi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/60aq4peibk28s6a3d8f0fj7u54/49279130838.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1c215c90d---kiwedanowavunubudi.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/turagituzatajabemerizo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cc5e0b89a---97468923237.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/vururajunavune.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/vitof.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c322bbac9---digavelesadi.pdfIn PDF document text
    • http://yuha.be/_files/file/fetamopojadilumobova.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/vikup.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/xipasofifojejojefanesu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16073d54ada2e2---tabokerakap.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa182748641---pugovagazadore.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/q1frob4uofcjnc1gs8ifn5tcb3/26720492269.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6733c0349---84825759188.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xedexovewi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160724a2d1d310---dinuruxodepururokituvi.pdfIn PDF document text
    • http://msiutilities.biz/documents/geketetevum.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rozajutisapod.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086210cdc0e8---68057322033.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/bozeputefuwawasirudo.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/40017871670.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097068885225---20402502449.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/92779382860.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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 11244 bytes
SHA-256: e2096598bc2b4c6c32cad9d673ff817ceb2d132e40376dbbd54a637cbfebfb8c
font_01_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 16100 bytes
SHA-256: 44761d99c465823f1555329677525109cfa387fa91fbb0080f714e92ac4aec59
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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