Malicious PDF — malware analysis report

Static analysis result for SHA-256 96685b1828540d5c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 17:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 722fa6d601b3219432cf7c59f453b526 SHA-1: 92c7473d59e27e5e61338b2e65002c72f1717059 SHA-256: 96685b1828540d5caf07da575cd46ee9b83a386abf6d95335651f7eca02219bd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, many of which are hosted on WordPress installations and utilize form plugins for file uploads, suggesting a tactic to disguise malicious content. The presence of external URI heuristics and link farm patterns points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=stereolithography+systems+pdf PDF link annotation
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/8t917rig7adope5g2u7egf9nss/16575856071.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/05d2010742e21ab2ec671d8a11b61b55/99621933064.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2a08333b---87972501163.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070569abe14a---45958004969.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/libuzimewozori.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a71485068---71690823854.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/97555341236.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/zagulakoxolepuduxugeruvif.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/rosuf.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/tubupivar.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a0909aba---15484994458.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6380270594019e5f6dcd05299eb4b873/37876888967.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3fad2b525---nolibuwuselelataxikas.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/migox.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/99508661858.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3vene8v0mr3k60snbpmjpp39s6/bovafowutizisabofebulid.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160846d9f932a5---79485872307.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/17556cbk5hjmmoeun6mgn2o5i1/pokivori.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/73138117518.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/webagi.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/610e844d0313392b6eda6fc129cb01aa/33789236879.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_off0000be19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE19 16508 bytes
SHA-256: 724e1a1af704940dd94c6abfdd174377d17f0fa4953c50773033b1ae4e8d4ed3
font_01_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 11032 bytes
SHA-256: 8b7f598521007492fef99def6fe5154d10b93cb2c4d5f8d9cbbe53d2726dabc8
font_02_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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