Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e807db42cde82aa…

MALICIOUS

PDF

98.2 KB Created: 2021-07-02 04:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31e3b1438856e0e0c42490c202ccf2d8 SHA-1: 52393780ab7a9bfe95a2d0f41a41bfba20ddcdf8 SHA-256: 0e807db42cde82aa04287151140df4928f2eeae8e20dc2517ec0b41c0e6f6c47
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the nature of the embedded links and the heuristic firings suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=famous+chinese+desserts PDF link annotation
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bbbf49652---92166591068.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/zosumajizojijujedika.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b12c83768---99652015925.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/tarowojopojusugiraxedolir.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bb976a8d966b34090dac78034d431766/xewirozuzasizurelezeju.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/toxabuk.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ngak9bnj8vjl4tvse225fipgr5/63046561836.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/jarike.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/kazafabedeberovi.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/titifokesuvilatonagemise.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf8c03e78---fakurekaxuribavawubi.pdfIn PDF document text
    • https://amblamy.ee/upload/file/migojoratutewiromi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5d60518ad---piwalimi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/38507974142.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd8cd5467d---61150087227.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/rafawedavilomazuwavufuz.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6fd069033---15810891174.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840c94d533a---kiwarataso.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/80cc6b02aa17466198991474f9bca21e/gazumaxuwunubewedi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nedasetadubanoti.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wotanari.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/89e66b2beee3181a4f4605861f24a226/bokanototu.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210619190252.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 10668 bytes
SHA-256: 739568d4b732016f44b75c19aa4dce5e4d881b4fe959b6d2357921df4fd84518
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 14328 bytes
SHA-256: 7bb965a1a527c53a4788848d90719c8d15dea7fa0246103b5f17812f5651890c
font_03_sfnt_off00014c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C86 19092 bytes
SHA-256: bc1b1f75af9b4bf954c632d378a155ed055a29971fe750d915dbf492f046c520

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