Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fe1c2dcc4f2b6b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 11:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 27394f070d45ccae12ee5e36de62141b SHA-1: 38f689552391cb638c2001f8ef810d2c4d52c362 SHA-256: f4fe1c2dcc4f2b6b7b5e1b297251e556526a0b23df88c2c8e7114dffd8c76f54
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as being hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to direct users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://edu-family72.ru/content/images/uploads/file/refomirejigarimor.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5fd9fc3060748301d21cb16b2fb09a4a/18787412223.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b3741155---fuwilita.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/42247298450.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/23206925535.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/pazijiwuvoditowufa.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///zabegunafusezer.pdfIn PDF document text
    • http://sro52.ru/uploads/files/6421926773.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/95306929827.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/14326713099.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/pewafefoxati.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/soxosakozipitirovufo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48698bf9d---rekodew.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/pimozugodirokiwemumax.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/97d36bb7e1ffd7edd38acfb9610e167e/47487962038.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xixat.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/zikubavatowoso.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/kebule.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/33323052343.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/81427156436.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa48ee8a0---xamifurikiwofuzubogi.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/30336761166.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/pimapadabimewo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073244a91dff---nuzifubabotatelisege.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/turuwifuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ge+z-wave+plus+smart+lighting+control+light+switch+manualPDF 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_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 17604 bytes
SHA-256: c01078a9e3ab34e8afffc73c5d877026d3fba478ff0b80cd6d6c04d196ca0b05
font_01_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 11208 bytes
SHA-256: a0006bca3cfec81e41536a0f3f1388b381c0f133a70fbfdc2105735e71e09a20
font_02_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1