Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b851159cdd4368…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 02:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93086a1987420a20a7cfaf5ad08845cd SHA-1: 82de402f6538d100e1f97ef23484334944accf98 SHA-256: 58b851159cdd43689d632d985fbd8c47ee9bb90a85b221b682a1ec6c9f20f4aa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS uploads, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL analysis point towards a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://laclonghotel.vn/upload/files/vuvexamibewawegipif.pdf
    • http://ambulanceservice.pl/userfiles/file/negodogudexavesegoparular.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/35aedd7eabc071d536654f99fd72fc04/josola.pdf
    • http://www.gabrielamaciel.net/images/content/file/3649846127.pdf
    • http://delvalle68.com/clients/54584/File/vazubebiduzigubawegi.pdf
    • http://envigest.cz/upload/file/37345536852.pdf
    • http://ahkkpcm.org/userfiles/gigerokasonuxum.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/fupimit.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/60c6cdc86269a7da07c2601b92dfbfbc/tefumapeki.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a6f5d330---zefevabotowazunabomag.pdf
    • http://nadiadsa.org/userfiles/file/xaxelunegapazofuko.pdf
    • https://aadharshilaschool.org/userfiles/file/bopuzebifibokudifujeg.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d44s641k3hau642e1fb7unckri/lixaz.pdf
    • http://shuswapladystriders.ca/userfiles/file/72269410651.pdf
    • https://perfecthospital.org/FCKeditor/file/terezaderokikekolov.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16f4bafa6---torejelavobemaloj.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715283824ae---lejitifesetukosiga.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a806971a252---sigibozixexo.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5477c3cf---7772264803.pdf
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/tefedawidesezepup.pdf
    • https://glycocalyx.nl/userfiles/image/file/57694774478.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32223cdd4d---zosirijizebenur.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9d190dd99d358aecf7cb6b89e14516bd/fakemoripanatujuwi.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210801_AF4BBD689F063157.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a5e6b5feb3ab4ef62f3066ff163a0c04/xugekakilufamu.pdf
    • http://seoulsquare.com/userfiles/file/vadoxifamasidevikezuv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cotswolds+map+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 16792 bytes
font_01_sfnt_off0000e2b3.bin
8038d89e27449cb95c30fbbac318587daa9f7c801ba514ef1eaa0f8262a45448
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 18684 bytes
font_02_sfnt_off000112e2.bin
42cc4b8003a79edf05ae9e3de86d3fadda883ff3c06fb286f4bc2bc5c8b84ae0
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 10348 bytes