Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34fa992fdfc7200…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 09:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 791a66a8c7ef44d19684e245e9d0454a SHA-1: eac66d4628d124448f602992815a2de7ba1746ff SHA-256: b34fa992fdfc720072057ac4df15dc18f7176346adfedbb50191064286399745
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://agriturismoilnoceto.com/userfiles/files/mamuwesulosubisajopiris.pdf In PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/2820289335.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/95544258382.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/nemanaxosusuzasidagawiwu.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/28154163021.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/61c16e56bdb526f6a830cb7af7a8dafe/95618450132.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/69700313781.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219505650.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1615358cc6f75c---doxobanowupajib.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/96352123870.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538b5419a5b---juxomaxawisuk.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/jusematobejemazejoluve.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161535c3e7c86a---53397698963.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/77438111945.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/43214977864.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614256efb2276---kevivugiviguboberateka.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/bigebikave.pdfIn PDF document text
    • http://15881588.com/ckupload/files/zagelunatuzowerex.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/severan.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/97834056090.pdfIn PDF document text
    • http://hijoin.hu/editor_up/duwizikijigabitug.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/75469489043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=make+phone+call+over+wifi+androidPDF 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_off0000ae73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68A 10688 bytes
SHA-256: 3aa97a1fe89ebddb58ee21cbfa2e04749863a2b358fc0ecb9b8c302c6d8149ae
font_02_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 15256 bytes
SHA-256: ca05af9c7f6f2b254255720719a539f7a43f4a5da016035cadb9da54212153b3

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