Malicious PDF — malware analysis report

Static analysis result for SHA-256 599eb2c28dfd9970…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 20:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 73a9c6d3759201de2aea7b047238d665 SHA-1: 44af12dca36e032dc740b94b9a01503fb71ac411 SHA-256: 599eb2c28dfd9970b8724d301bd81ca5907b9f005559191162f0428d97a62076
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic points towards the document's primary function of redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=sovereign+city+definition PDF link annotation
    • https://rux-thai.com/ckfinder/userfiles/files/logogerevofiwajuf.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20211002_F13D19DD2FB972C0.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/96180176682.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/tuzefugavifekisobul.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151348f4090a---86394843876.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/lemomejenazozux.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/95237123291.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///puvibuduleja.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/27708005492.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/51328229570.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/93910286570.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/magodonisu.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/56523001642.pdfIn PDF document text
    • https://timminsrenovations.ca/file/swD3FD5Zj8iWx1bh.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/54556082257.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/72300696756.pdfIn PDF document text
    • http://plncse.hu/php_data/file/83759525519.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/kupaset.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8f574927---luzaga.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/55786614881.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021092900493150401.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/53102205223.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155eef3a5f40---xujalivepojonurezod.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/83763900541.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/vigidexisedinovorenubetu.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_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 15324 bytes
SHA-256: 54434bccce1bb7b94e61f5aa9d15b79c85a23c4d8b50b7ee8099bbf76756da50
font_02_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 10528 bytes
SHA-256: 35ee2f0ffc0892b3dee378b0d9f12ed95ea2ccba0792836ff8bae7490de41165

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