Malicious PDF — malware analysis report

Static analysis result for SHA-256 308635d2a5388482…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 01:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d910dfef3738a78c8c2bc9de56f0abfa SHA-1: 328fa417c964c64331dc57f82e6f7483df0e0bbe SHA-256: 308635d2a5388482fcb05814fd9e215544dac9cb220146d9b6949c2906a45887
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • 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://benedictinoselrosal.org/ckfinder/userfiles/files/zokedolupaxopufip.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7dd1431898a911d8029313a457632c32/6922925198.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1b6a4025---buwunejonemug.pdf
    • http://ibconsulting.it/userfiles/files/lozexixozup.pdf
    • http://seattlebestteriyaki.com/uploads/files/rusase.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/volelulalu.pdf
    • http://lyzjkgm.com/d/files/welinazudevujuvigixex.pdf
    • http://hurtglass.pl/upload/file/27227385767.pdf
    • http://dmychadla.eu/UserFiles/File/pegapevorupijakuzosu.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/43856205812.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/35915570649.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16136058250805---kawulukasujuwipipelikufuj.pdf
    • https://khambenhxahoi115.com/images/files/66406030847.pdf
    • http://nature-revive.org/files/file/96169237200.pdf
    • https://groupburuemas1.com/contents/files/turabofiwodenikigulababo.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c2d64f26---keridix.pdf
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/89114406781.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/mudotarugipopobabugakazi.pdf
    • http://gapp.fr/medias/files/57133173773.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144b80fa4894---wufaxasatasivivipa.pdf
    • http://hataylezzeti.com/resimler/files/11054358545.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rich+dad+poor+dad+pdf+2017
    • 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_off0000e015.bin
76db1dc70812f29f88fc68319e100a43ca5d922426dd7917b723445d62f10f69
pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 17824 bytes
font_01_sfnt_off00010e04.bin
42c96da8a9a92b7714f2ff6e2cd2f53c677c6884541df515a4d5288b598f8b28
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 10560 bytes
font_02_sfnt_off0001264e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 16792 bytes