Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aec2e2f977cccb2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 15:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 945b90228b248d7656b1b57dee074bfc SHA-1: c7c24edaf0bf3146fc61c7ad3b8ef4753a0be8b2 SHA-256: 7aec2e2f977cccb2b6ebb08a1c2aad8cc35c8ed624dc8059ebb7601534c59825
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • 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 https://drafthe.ru/uplcv?utm_term=cook+up+a+storm+full+movie+download+in+english PDF link annotation
    • http://arablift.net/userfiles/file/97237996602.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/35128915046.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/tituxekelivejosasunuweju.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/33c87084b672a4531a5631ffefae0b65/fakusunekuzimosunonagowu.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/zemavoponitodabe.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/16019408147.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/bapepino.pdfIn PDF document text
    • http://novichiha.ru/pic/file/93204693747.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/21475454084.pdfIn PDF document text
    • http://soles2walk.com/data/file/39715923691.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/zedixafimoroserevovel.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b8858f6eae308089c64c5d3684eb3f6/metajasi.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/24361443293.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/92471140685.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/97529728946.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/liwedu.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/nured.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/11881434221.pdfIn PDF document text
    • http://kco.su/userfiles/file/biperuwuzesekilenadezosu.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/91166648573.pdfIn PDF document text
    • http://halmar.info/userfiles/file/44238537198.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/lemepawokaj.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/jijagakizugiwikemed.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/72193259258.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145363b162e9---35229249708.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/39277098189.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_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 11320 bytes
SHA-256: 0380c437557e9ac35b74db900f9e46db3e756145b567c93a74d1e09ade983b39
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 17140 bytes
SHA-256: 5e0bd8fe61f8f12b699b6a842b1e69fe030857167e093ef52ef61ba52badf987