Malicious PDF — malware analysis report

Static analysis result for SHA-256 638caef4b8641cba…

MALICIOUS

PDF

75.8 KB Created: 2021-07-27 22:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5dd7cab023668d415ad940e778d7b2cc SHA-1: 7f4107e01760d9dc6769d402e4233a2acd3652b8 SHA-256: 638caef4b8641cbafcb82f878915c73aec6e55e15396346b52900dac5f660014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites or other potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The file's structure and URL distribution align with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f3d8418699b65f2dd1bd674f5af06470/nivorowosegi.pdf In PDF document text
    • http://posekatzahradu.cz/files/file/17069178916.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/tidasuzuk.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/41848752333.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099978281f45---34403079594.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/bekawuponavovalofabu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060501423430.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/48084443708.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608787311f8c8---lirixikugelejimudikawif.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/sisidukakub.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c477674eb---zusofuvoxiwejarevegokexu.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/vapejamujusoxokotolenuze.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6dd0085695f8aacf1b4191983f5920fc/83128103722.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/2f3db9e31e95a0d3585d5e20bb056e8c/norumafepusiwomijameg.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/powisupoxewikitobizanu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ac5e7877---baruvuw.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23790655ed---mogefesidasid.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/kuzoner.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f0c02e6b1---55620840329.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/togoluj.pdfIn PDF document text
    • http://belst.by/upload/file/27956897268.pdfIn PDF document text
    • http://zxsolar.com/d/files/92041389183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+clean+fujitsu+air+filterPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 16096 bytes
SHA-256: bcbf00ad90ba37ee59b52d59a875cde732646266f3d56584f8ce449ed7f2e991
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 10636 bytes
SHA-256: 17e115051209cd49a4a4dd19be4a8c8b24eb407d26ee2af2ed8dc3e30a1ad65b

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