Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f917fb05e0b640…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 04:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a64f7e01f6a94152f19d05f5a084688 SHA-1: debaeb65fc88ae27e4dac38235ce11437b003bd5 SHA-256: f8f917fb05e0b640a628b01990ab5f2d2bd6b073615949314cc6b20bd666bd98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=free+unused+psn+codes PDF link annotation
    • http://talentfuturesservices.com/sharpinstitute/images/files/wiribaxofabumofelu.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/bolizetejo.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/57669879778.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/13918392792.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4636ce45e---62733692673.pdfIn PDF document text
    • https://amgaa.org/temp/files/magixep.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/vexomabowidimodavirasag.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/pamofopizaruloraniriwori.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/warekad.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/lukowup.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210921054913.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/rekolezetip.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4906cd1bf---volenixemek.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/51943938422.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/jigusufuzugerezilogulejob.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/mudeka.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/merudawe.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/mifawijikofavitokesi.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/9371104802.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/63797430406.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/14446850495.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/643225799.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5180b4ac---tabivudebisatoz.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210901210400.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_off0000b355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 15756 bytes
SHA-256: d5705b5a85004f101b20a845d5846b0bcce87325cde34e4acfd67a8c1d540a56
font_02_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 10188 bytes
SHA-256: 6cc149836761b17372fdc7730c33aeea107d25f8c1632a7b1e0c6e6af9ac59fe

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