Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd25fa9e25dca98…

MALICIOUS

PDF

73.8 KB Created: 2021-09-12 11:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 403b064791c01c0687ce597a85f36bca SHA-1: 2b9d5144ff27acd7ba5e645f94d47acd69986de1 SHA-256: 9fd25fa9e25dca9813966ec7259b5a95e77dffdb52922be27c874a577c91fafe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the structure and URL patterns suggest a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fisioterapiasuzzara.it/userfiles/files/bidakefogaj.pdf
    • https://cissud.eu/uploads/ck_editor/files/fazomexe.pdf
    • http://reklamavysocina.cz/UserFiles/File/kixifekujeboliwekanegore.pdf
    • http://restavratorstvo.com/ckfinder/userfiles/files/22798489189.pdf
    • https://psfund.org/public/uploads/files/cms_files/mamakafiba.pdf
    • http://border-collie.ru/sites/default/files/file/54804054156.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300c141b5bd---gitijabu.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6a76722c2---vuruwalevoxoguwofa.pdf
    • https://bestcaps99.com/ckfinder/userfiles/files/xeburipisezo.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuwujemez.pdf
    • http://zhhyhb.com/uploadfiles/files/taxijujoluxoku.pdf
    • http://alpinist.store/sribati/editor/uploadfiles/5872027458.pdf
    • http://kimhoatra.com/upload/fckimagesfile/46387219395.pdf
    • http://autoklej.pl/app/webroot/media/files/49836296747.pdf
    • http://okvin.org/userfiles/file/getiweneno.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210911_094509.pdf
    • http://krukewittfarms.com/userfiles/file/tajamijozakakugebabiriru.pdf
    • https://brillimet.com/uploads/files/202108312018306638.pdf
    • http://acmemask.com/upfiles/editor/files/85719026389.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138956581811---nepedibutito.pdf
    • http://www.petersonassoc.com/emailimages/file/tivuzodubezofaroda.pdf
    • http://dezmaster.com/userfiles/file/67632282112.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/nisixapezuxinibos.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/85357392520.pdf
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/59647902855.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=eeswaran+full+movie+tamil
    • 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_off0000be63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE63 16792 bytes
font_01_sfnt_off0000d675.bin
0397d55319a74127608d2346e1a57d4a934562ea1a751ff3273fe8b3eaf024b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 16540 bytes
font_02_sfnt_off000100ef.bin
6023e3cf5afd670a670d86494de422499ade326bc49d51b467dc642aff2005a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 10608 bytes