Malicious PDF — malware analysis report

Static analysis result for SHA-256 3983bf1f09c165a5…

MALICIOUS

PDF

80.0 KB Created: 2021-07-13 22:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c328c982a7562dc1f79f0b6202fb371c SHA-1: e22458e116f4bf6da34c39005bf041cf7f70d60c SHA-256: 3983bf1f09c165a5aebeac687b3c17e2310dfb83162489cf1122eeaadebd078c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://jnnycc.org/userfiles/file/fowif.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0fu1s2uu83lf0o9c033jd0fhpr/sujulosatadovalexazavanu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609495d600196---xoxigokavatoduwazuxawoxu.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9987ac66fb68c2bd3bfa82a8aa40e117/surebidibopasufuwix.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qjlrs12fv92bvibno24o3v3vvd/vagekisovanawofizije.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c53c36937---potekajenotejubijunubip.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/leledirefiporowulamadipo.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/pumabapenuxapozipo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e73cbba63---1966464296.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/87116363592.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/52675454094.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/91800717832.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/mijanenezeli.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/lewazupason.pdfIn PDF document text
    • http://chinazzjx.com/d/files/piwisewabore.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a7e98393d74ce4d48111e8f17aca78cb/98220668055.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d909a6b719---ziradexagamopubexuwixilo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/351455977246f25ef17c1b774383ea93/vomowoziz.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/254e956e8daaffb1ef9f378154bf2a3f/rusenijaradadenufajip.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070155d47f2a---64222887120.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/72572894130.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/3306695951.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/files/rubisadezevulifuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sq+mm+to+sq+ftPDF 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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 16992 bytes
SHA-256: a0dae6dcee748daf64eebe48e8bce2b21693b0748670c0e200971de68de593da
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 9960 bytes
SHA-256: 5d2115fbc2b9746acff47bbcdc3f241fba8f6f817aa07f115c37f023da8bdc96

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