Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a0ac17b6a6585d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 17:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ef690e3d5081a91629de265a53f690f SHA-1: e9a8cd3685f0614ea106fec2db714cee746bb4ec SHA-256: 70a0ac17b6a6585d64d719cf7ba07a57ebe60d79068377dfc576f3c18651c07a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=you+get+so+alone+at+times+that+it+just+makes+sense+pdf+download PDF link annotation
    • https://larrialdiak.es/files/galeria/files/67111741016.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7ff9578f---14568559430.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/40651898371.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613803954afac---27480746921.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/peliw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd67d94f11---13020177630.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/96107104158.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/43209300798.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/33734604015.pdfIn PDF document text
    • http://moristas.com/userfiles/files/sevaja.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/hp2prcg8p13mtc2ihpjkmr7in0/72251175317.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/gaxexativenafimakabug.pdfIn PDF document text
    • https://bfull.ru/uploads/files/judavepude.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/defumaxatevexinijikav.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141811dd07f3---dajubesugozotosu.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/neveguduvekuligub.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/jemuvip.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/24580953689.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/nomalatukawowadororojax.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/kufedelagisa.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/kobiwuwajof.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/zevomi.pdfIn PDF document text
    • https://topupdana.com/contents/files/4260115245.pdfIn PDF document text
    • http://placc.info/up_image/35661504787.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f34e57c8---peditifujonudo.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/jubefifubakesekakukejos.pdfIn PDF document text
    • 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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 11236 bytes
SHA-256: db9d32bfebde486891a89c28d59edf9e586a0d644e8a45c550cb85df02d358d9
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 18468 bytes
SHA-256: d6b0a77c39c97d949e223c8f2a71406349cf53fcac287662e3e3fe868c987307
font_02_sfnt_off00012b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1