Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b41705269433878…

MALICIOUS

PDF

83.9 KB Created: 2021-07-10 05:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8da4d7d93d5674593e56c07e28f3236c SHA-1: e09604b885b942ab734534f0fd557eb19ab64443 SHA-256: 9b417052694338782a5c2ad513c8558f961cd73c44bcf33e71910fc0208f712e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://townofwinslowin.com/flash/townofwinslowin.com/file/79805025518.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/3815f5793b24d6fd614ff0452c248284/fiwuduke.pdf
    • http://studiospazioambiente.it/userfiles/files/1242399319.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1vjr5bdkorof050mjvqdoqlcve/tedojefelanelivajazelati.pdf
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/limolexulakovurivumig.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/de42108c9b0f93bfeaa9dd80d9bbe1bc/tizevaxofajojujamukokuxu.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/33d14ff1328062ff1daf605f9497bf5a/46327903379.pdf
    • https://study4student.com/cache/fck_files/file/38407453954.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/36997884031.pdf
    • https://equinox-e.com/upload/files/dilolukofefik.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887316dc36a---11441042567.pdf
    • http://artospace.com/pics/file/zabagoralagidutovuvonis.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc4ba40a0---niwoz.pdf
    • http://donghocasiochinhhang.net/uploads/userfiles/file/37274704913.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7296bc325e---xisuwepesowutabixu.pdf
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/nokuxa.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075695be2dee---dasivemofazimaviva.pdf
    • https://vigiweb.cl/dinamicos/files/file/kipawufumejo.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acf636929e7---29808738391.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/8eapjd5eocv3u04nrgjfidiga3/lilurawonudexufenejira.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vaeg62ih8on2b25d6rq18mv3td/27607161544.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9a5e804f---lapoxedolu.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f01ecff43801c8b908729ddb63bc0e2f/gelipurugovunifadarapu.pdf
    • http://mdsalon.ru/img/lib/file/dabojoxapakigolarubexiro.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=km+and+miles
    • 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_off0000e730.bin
96f49f9ca398a4f170a5b4e1440e763f95ab9da0cc3b5532077796fe73f0dabb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 17252 bytes
font_01_sfnt_off0001146b.bin
1236214cea9ee86352ce0a5be102ff7b3f986655918052d9157a8ed9371f7dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 10080 bytes
font_02_sfnt_off00012ac0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 16792 bytes