Malicious PDF — malware analysis report

Static analysis result for SHA-256 db33471d6f93b18a…

MALICIOUS

PDF

89.3 KB Created: 2021-08-02 16:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ec3f13de1685ea8bd9d5446832a86fb SHA-1: 562125c11b1f5517d5ce1acded495c2bf889f332 SHA-256: db33471d6f93b18a74c75caf55ec22f569ad0f8bd0ff0e449a0dd17c66f9882d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://wastran.ru/uplcv?utm_term=cosas+que+tiene+un+botiquin+de+primeros+auxilios PDF link annotation
    • http://serenetransformation.com/clients/870552/File/95963668234.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/10257070419.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/aadab5e02aefc354cb87be40b745ccd2.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077353930c11---xoposoxuza.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/nqlldebkoaj5r3mdpinrlu3c48/78538247319.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210629_870F845C8DFB0381.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/15148578967.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/99420274345.pdfIn PDF document text
    • http://jarosi.hu/files/file/17131551498.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfcd671a3a---87311435667.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/zujezutijile.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210709_0D81AF1B7930EC1D.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5615d96af3---22264611466.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/87385483407.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/vimolilidasituro.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/tipidabaxa.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/wejarijiru.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52ac16a8a---26097251115.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79265489977.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/14260477712.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/88670961795.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6c7163af---kimogise.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a86e6b629---fumuzixutebe.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/bonaje.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_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 17380 bytes
SHA-256: 8d6ba9049cf51d2c7657e1210838aad59b5b9acbfbffe48059a7b0f1f0f5b906
font_01_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 11072 bytes
SHA-256: 7058877680d651e57a3bb17763c1e01299f022a26514fd0e4e310fca34787d69
font_02_sfnt_off00013c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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