Malicious PDF — malware analysis report

Static analysis result for SHA-256 165b84a86cdf0b61…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 21:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ccd9970b4fae59c4f85fdbd9de2274b5 SHA-1: d1b287ac2238d07f2e66b57c8950151ed0e6317b SHA-256: 165b84a86cdf0b61d01a8502eb4d505e636f3f858a74772e7a1255eb5434b22e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the PDF structure and numerous external links suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://pixomot.ru/uplcv?utm_term=distance+time+graph+worksheets+ks3 PDF link annotation
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608535af49fc9---rarev.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/78ecdc49d83d956b0c6fc571879fc574/62087392468.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/33017466640.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/gikemi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160701ca475859---42135969239.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/28054214169.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bdbdb5732a---kezamus.pdfIn PDF document text
    • http://internationalbeautypageants.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/1444715089.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/324cae76b9bddcffd0a9be9e22b8831a/levopuvowiv.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/aa4246203e52c5786c85407a26b3e2f2/32539083389.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/vozuxoxani.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609403f35287b---11516850201.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/77245710875.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/munagifel.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/mavug.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/53842503707.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/xukoxiv.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/gozoxidusexokugeliloji.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/vezoxizabejitibudadi.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161239146e9a3f---fakusimadineborutubimo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608130ffc924b---lozefakega.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608580b28c359---16355269065.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/natoru.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/15030974325.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ebrr50stuf449k2o11dad6usnm/jopepibiramixodunufope.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/57039884863.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_off0000c864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 18620 bytes
SHA-256: 98adf01add0bca358cd01ad113c71e66107ad2b4e0f428b29e6391b7d7442baf
font_01_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 11124 bytes
SHA-256: 39684daabb8ce8be6b2d2c82317817abfc16dd56b6cb92714a431ba368ecb38b

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