Malicious PDF — malware analysis report

Static analysis result for SHA-256 6832172832311083…

MALICIOUS

PDF

73.5 KB Created: 2021-09-03 17:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b0ba6facf2ebc32652fd169eb2d54109 SHA-1: 4cb22afd1230ca150adbf59dc11c772b3f0c916e SHA-256: 68321728323110837d9460c6c1807e75b0d64d2e444b006214fd3caa58cb1963
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/nezipagabapobe.pdf In PDF document text
    • http://npas.ru/pic/file/81803887991.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607670073e1e9---wedenebomitomijimo.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/77ccccd4e184ba7b5f55fd5cd1b1db9d/55426065249.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608310ee8f850---tilutabaluxuxajub.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/katoxavigawuwex.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfd28843b1---24417322781.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210630173035.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/18453048760.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimigunerozupaferabagiz.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/92625392515.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/65763441117.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/zofatitezaw.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ae0f2b92---najujobopotogiwap.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/zizumogelujin.pdfIn PDF document text
    • https://blugarden.eu/file/55486572392.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/60924247962.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce017373e5---dorofokun.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fabetefulobukoge.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/97243569013.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/89438812514.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/balupijuxemavulomegedeju.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161090641614ef---2185801668.pdfIn PDF document text
    • https://armenia4d.com/contents/files/kabosuwaniregonoj.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/df7e42adfcab509a2bc3ff8a198a2ee7/dememi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609010bf6d450---35878510423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=brainstorming+business+ideas+worksheetPDF 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_off0000bd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 11120 bytes
SHA-256: b10327ce237666f4ebbb2c16cf86ac18a03a06c90fd0e5e262cbbfab7ca46b0d
font_02_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 16120 bytes
SHA-256: ef72a712eecad8c4a856d1b13de64f9dac5890505a98f7105a9e2e5cbabb1d9d