Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4430438c07c57d…

MALICIOUS

PDF

85.1 KB Created: 2021-07-18 06:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d41ea98ccf1a2780fa9d7cab5f926578 SHA-1: b1ca4470c31736a362fcd279275a89472e03cce2 SHA-256: fe4430438c07c57d7648dd3148a46e1685cc9635599112c59c7b3866959b1be6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. ClamAV and ML classifiers identified the file as malicious, with one heuristic specifically flagging it as a 'PDF link farm points to compromised-WordPress upload storage'. The presence of multiple PDF files hosted on potentially compromised sites indicates a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://royalwedding.jp/images/blog//file/45231242251.pdf In PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/pafazivatutenavitewaxapo.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/vebekuvokogerevonij.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ff7fc0aa8---fojorezarosavosisotuwuza.pdfIn PDF document text
    • http://thedreams.cz/files/7949254704.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/418905022.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/36579971864.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/70005584690.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50c176a9bf---suxeler.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eoc1tt1l4fco01ah65f298t1g0/fixejugoroviseduxajuvuras.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/iqsicrpcbt523fq97sb3b8edt2/fupumibosixosage.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/jofaxasuxitapimo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/1ce0a1479b9ae7eee87964ecd2454710/48118963091.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/pajufomibevazifoze.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/fibokutugatufuzowadotofag.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/36808739943.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/vamodedutixerapusasixu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f547cdd052---52954858545.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6ab1817e---nixuza.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/77071518953.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dbe41cce2---livimigagusidexikezokedu.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/tixefijugisosujiju.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rjerkbo9qv3e62jnla4plmvu9g/24907323488.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/fidemaledavajogup.pdfIn PDF document text
    • https://actorconseil.com/files/file/nutosikawel.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6e9718304dc530dda51ac4e1c743f85/tovosugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=silence+of+the+bees+worksheet+answersPDF 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_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 10828 bytes
SHA-256: c65af34d2db0b5649b3a75fadd2c49862f2d711640e4f5e0a539c2e932526d1f
font_01_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 17660 bytes
SHA-256: 1515b474c9aeb184b3d5f63055ee534258f4d3eedb75285a9d43c16ed3d1825d

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