Malicious PDF — malware analysis report

Static analysis result for SHA-256 4700239eec925e6b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 22:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb63926236400db07103f4c3b9f162ad SHA-1: 9955d137a9f60e076367ef36521f3cb5b816123b SHA-256: 4700239eec925e6b488da7215975970e884116f86bbcb6863e27231a84ce28ef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting it's used for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17945039da---50514644629.pdf In PDF document text
    • http://mpti.ru/userfiles/file/gezamimevenemebigidegas.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161346f8dcdfad---tifemikedevewul.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/42694430415.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/66487580048.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/nesunezaf.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861cbf59f16---dimofixat.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/52214959878.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab18417e81---binodume.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/wizizamo.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8ec832eb49e7617325c00f4d387ab1f5/kizizigudaxelakefujewumi.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/44969699079.pdfIn PDF document text
    • http://aven.su/userfiles/file/datejus.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/90082622381.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/xiparivig.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210716210927.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/34736148528.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/0e1829ada246b982fb82a2e51da50ec0/xojunexepibu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/a0e66ntldcs3iont4jhti3b7k7/joxelamubino.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e750c03d23---19806947017.pdfIn PDF document text
    • https://digireg.org/upload/gofubipufi.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/68408877482.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/67428049539.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/ximoli.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4136e52b---mosinovazexigeroronitek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=urticaria+dermografismo+pdfPDF 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_off0000c29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29E 17360 bytes
SHA-256: f00c365835956cb32e85f9bebece2022312f4a48f7da104a2b013c866a1bb545
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 10820 bytes
SHA-256: 921e49ef487961b2e5a7d5b688e9200a3343bd66d1a687ec2d0a0cd590d8479c
font_02_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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