Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ccc855f3533a0a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 18:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6163b15023517574770c43c4d2d2f6ca SHA-1: 7e50b4f04f2d1a2821b71ff46d31db718922ffdf SHA-256: 69ccc855f3533a0a29f690be528f61e9f20265812dbd0fbe5f2a115f38a791f1
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. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=c%2B%2B+smart+pointer+tutorial+pdf PDF link annotation
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a8cf3e26e64a886c1002697afbfcff1d/34419838287.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e2d9ac4eda75eb5fb432a209819c161c/wevedifikizajol.pdfIn PDF document text
    • http://belst.by/upload/file/74585156715.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/15833911450.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c27611a5ce---17944242607.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8bed8f89c---5069180343.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/48889783238.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/24224278179.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/32e3fbf463ebcb215a2b1e9feddea968/zexeke.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/62696053719.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/96307517ebc2a4b9a8aff5921f419ce4/28646661571.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/mmhb1n3noo8omdb431dsbb5io2/wibamovajobexuw.pdfIn PDF document text
    • http://machin.kr/userData/board/file/meguxigerawami.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b2975baa---45676236425.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210804153715.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210620063822.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/luredevirigetamonag.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/83084420179.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2ac0a691b6e8e1abe71d7f2051b6111f/8476438336.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7f9afe8cf377b3b5a6aec7e465332e5c/girasopinot.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/totazetuzikipegeju.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072a5bb34dd4---79737103457.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/72988069010.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_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 10788 bytes
SHA-256: 767a228dc598a9e3c88bb30d3fce4af8ae25866414766083faa0f29820f4374a
font_02_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 18508 bytes
SHA-256: fbb0a4ff9b107867ff986012d6efe2127aee0edbbe9a15334a154b62619f7b07

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