Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae33a1741e55f6bb…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 18:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea1f9016eafcdc9c5faf7b72c67c786e SHA-1: 2fc3ce5167f0c251bfedcba5ed9eec4bfd866687 SHA-256: ae33a1741e55f6bbfeefb47e35f14b30eca9a294981779be8d4ec45164760629
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is also noted as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://kwartetproforma.com/userfiles/file/61252254178.pdf In PDF document text
    • http://okwecare.com/usr/userfiles/files/komoxexunaside.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc6915cca---30903713509.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b37aea3d9eb---nogidenuxilazugajoxelus.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/mageruri.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160812649503be---1921826610.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/nagotatakebukofusomomasid.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0603/7e78a5110c8cc27c151e1ee0f91a3d8a.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892791d1283---53120527562.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bcade433---kutodinasofusajegos.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edbc33e78b---38253192861.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/11490452830.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/wuwitu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20ce713bd---33971909571.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/5mljlu04gr1qjkvi3fnq73ovmt/zeletiparomifu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073b0cb3bde7---63615562865.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ogib03iurm4r1q4ps6lnvp5pg3/90907979268.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1c77740e---13457599781.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bddd2d2f59---67711255620.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/8521927905.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d050c106a09---58713721646.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rjerkbo9qv3e62jnla4plmvu9g/24907323488.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u8247ldadepr3c65l5r321klj0/19341757199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=1st+puc+accountancy+model+question+papers+2018PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 17764 bytes
SHA-256: 6f4419efe2b997472bb2fbacfbd8c9c1d8fb95b2798deb345d3a7bb89ce399be
font_01_sfnt_off00011e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13660 11440 bytes
SHA-256: 702bbe56a47ce9d2c65589ee25db99b6a850b4986c17188814a18b614c49805c

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