Malicious PDF — malware analysis report

Static analysis result for SHA-256 820d5a75f2431033…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 05:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f5aefdc17580d344726741eda26987e SHA-1: 34bb4e74ca06f2882e31f63b8286f832787e2bc1 SHA-256: 820d5a75f243103390d81907120812c06279261383b34fcf2e2feebac9fabc35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=raziel+android+game PDF link annotation
    • https://100tmt.com/uploadimage/files/20210902122021.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/42268317672.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb28798a41---dadokuroxi.pdfIn PDF document text
    • https://ccskin.com/geektic/files/mutupofasurasotonafi.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/41850873586.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lpgu20b8tkhj66t9hkamd0utpn/gatotitokuzofomis.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/sitivadutifi.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ae708d743e472287cfe3df4bc5cf92f5/buvavozabevixu.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/zosiladizeponoxelofixub.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/1539649116.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/misiminaxakiredanibodivex.pdfIn PDF document text
    • https://hgb.se/filer/file/488989611.pdfIn PDF document text
    • http://blccy.com/userfiles/files/jobewotom.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/jabovimizuxo.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/vijadudexaxugopepig.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_10_31_57_9722.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/rokufarilo.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/81964851535.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/94651531739.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1eb36ef9420472b6b855ea28544cf223/77649619876.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e209b04593---47785014678.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/fusiku.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/jevotonitolezuwizinev.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/febolepamolitexenigumalu.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_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 17000 bytes
SHA-256: 5ab2a55fa1a3dc611362af84506ae4a632d680812e150bb81f6754e72c29e43a
font_01_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 10432 bytes
SHA-256: d7dd4fc8fb2fd13dbb71fcf6f057bf73a20e988f99451f0486ec58d68ca246f5

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