Malicious PDF — malware analysis report

Static analysis result for SHA-256 0461c2de4ad8dbca…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 23:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1684d7c6e653f872fd9bc460650e7e42 SHA-1: 333dd6d10e7e2d8a87c1e5119776b13c3f6e88d9 SHA-256: 0461c2de4ad8dbca8430bc8ce60503ebab6fa183bbe2e58a5cc3435e7ee3a140
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains. These links likely lead to further malicious content or phishing attempts, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e329b4574de---legurunijikol.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/nj5d09pd2v81rh8lqaaagbj3fb/71509992411.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/melad.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d8a24135d2e15d83129594d5a0534996/38676921110.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/21219068320.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/f2rdepmt2citmvrfijhqvfqnd3/9623422302.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/v808d23rhhs21bkh3c8ki4ldv7/14454762573.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160edf6c03e8cd---teriga.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1cd7e4523---dimixabaj.pdfIn PDF document text
    • http://www.polni.si/Images/files/48212364122.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc53fefc3c---73372841271.pdfIn PDF document text
    • http://planetamama.ru/files/file/wiwakipolexom.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/8dd7f802c458a6fef060d1766f985aeb/66158518505.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2cd249e4fc3b463950f5c980c1aab05c/koxamijozukom.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/82416244806.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34b4213d1---58215505150.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/60105717040.pdfIn PDF document text
    • https://iranjobex.com/cache/fck_files/file/dixizoz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7ebc8d60dc91564a6a2db95a6314f744/zejisosokigud.pdfIn PDF document text
    • http://chinahongji.com/d/files/3476421465.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/kowaralodofupunoduwok.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/gowuponifusifolisozexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=globalisation+and+liberalisation+pdfPDF 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://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_off0000c3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 16904 bytes
SHA-256: 95976d81a3a9e7c9bf70845e9998821df97608f6c08306054d35310b1fe89523
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 10672 bytes
SHA-256: 2803ab9b1fb45e152ebc6ee58cc3ada0fd2b0f5b9a5564fb6f6554769e2c01ca

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