Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90586420c481228…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 23:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a20caee10844de64f54fa12ef42539e8 SHA-1: d2c0d16c905359ca6f5cf5f8c333b1934ca1a79d SHA-256: f90586420c481228a8aca97428c5241a5ce02cb91ee79cc26a8d4bf4d2f46427
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These links appear to be part of a link farm designed to distribute malicious files, likely disguised as legitimate downloads such as software or documents. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer, potentially to facilitate the download or execution of further payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

Heuristics 5

  • 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
  • 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://www.prshots.com/ckfinder/userfiles/files/76832190388.pdf In PDF document text
    • https://llibreriaha.com/img/events/file/13576827475.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312af253825---vadovanaratekime.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d113450611---kefutixafedojotetobujoso.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613034a40a7b1---gasuriwiwaridibovoz.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/2334974326.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/xajixavobineterigude.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/1708159299.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132fabe270ad---94863230867.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ced18c032---91966558161.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7c4abfd5---mavijexuzufilur.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/fikebixuvax.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/57790829255.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/dijewajibab.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba5de4481---vonoxivilexepugusisomawo.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/voregadaturejuwubiduba.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/gonojiteluxino.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161423f8e588fc---dagiwelugofob.pdfIn PDF document text
    • http://keramann.ru/uploads/files/70894686764.pdfIn PDF document text
    • http://mylodge-naoshima.com/xafuza.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c5e5854d32970e0b183092aca4a1b21a/27408686575.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/karatusotudetu.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/wuzosanawigowu.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/46013100508.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/tazorevedonenatoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=instagram+mod+apk+unlimited+likes+and+followers+android+1PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 18544 bytes
SHA-256: 0cfbdce31309ac7d7fa8f4ebd394e11a7ee6eb5834bcd50a748f78dcb0520613
font_01_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 11120 bytes
SHA-256: 7d8169e2ff3ce10fecac40594ae014b91a9e0346f468d497ebd4d4ba11b2fa30