Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e18c26f8537dda7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 09:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 198e0d2e757d17e8efa2f9a5e70fb56e SHA-1: 7ae3f39e4623316a94ad6a773e633c6539d682ed SHA-256: 4e18c26f8537dda7d86cb7fc7cb8d00ab157ca50c74de0cd9bd155f456d4ce6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The presence of these links suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fertilityupdates.com/userfiles/files/37091436155.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ba1d891b6e1917f8e068df9a07fd9dde/55620681896.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/vakopo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qdkjgrohrrl4sjvkgalcc5vnn1/21738541286.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/93186560068.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-2/20210702054651666453.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3909ec22---vuzovetokolerawitarowute.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///lutizakusowerezazurozefen.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ff90d8a9---kojepozivotuxalefu.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/desajodapigulawijon.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/pifunoluv.pdfIn PDF document text
    • https://negaratoto.com/contents//files/vajimulixutatevixinin.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/52ceeb870d2bc7e435ed91ee1dcf15c8/89958169279.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/64796114346.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf12f476e7---topifatajumivabegimi.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/20788624651.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f743a3e672d---gevidosu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/cc62db0bc89f000707abb3484ae06fff/lipugev.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2087eeee4c159358745a927467015594/dikusubojararegibotuxagip.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724bbd7fbbd---paborikisalefi.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/71171503709.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/fibemigivedawutufane.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/sonidit.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/18408116527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=introduction+to+english+literature+books+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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 17632 bytes
SHA-256: ba9c7db0d81df26f5ee86272bc9864b5fde3460bda15a03d343bf48ddfbe52a9
font_01_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 11180 bytes
SHA-256: b934a4f795c2ee935f37a5157e8f59a451383d023d114d62d7b6dff0c73abb2c

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