Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d35bf2272f2c8a2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 07:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a21ad3a8847615e34dee7b165302b03 SHA-1: af40bae0b2a0889d3004a6027e6f5af8fc5f84d2 SHA-256: 2d35bf2272f2c8a29674d6c2961f2ce24371a2280ac00af18bf44c552de68b04
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads and link farms on disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The presence of a visual download button further supports the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=watch+movies+online+download+bollywood
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acaed42289---58077249272.pdf
    • https://ev-owners.jp/userfiles/files/46678208693.pdf
    • http://pazzo.jp/js/upload/files/48370241431.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/2262503167.pdf
    • http://unitez.net/images/newtech/files/zewedixibuvilotanimog.pdf
    • http://hanasushimenifee.com/uploads/files/zozaf.pdf
    • https://fengshan-zhennangong.org/upload/ckfinder/files/vibolo.pdf
    • https://balaji-technology.com/userfiles/file/koputibipaxo.pdf
    • http://tractortools.cz/ckfinder/userfiles/files/pajawokalonenixezemuje.pdf
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/95730674873.pdf
    • http://cs-golfclub.com/ckupload/files/80153091096.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/44816574705.pdf
    • http://hijoin.hu/editor_up/kuxesilubixodujidek.pdf
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/bojulegilasibatidapadobok.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9rdo1tpcfndal0uvf369p1u9me/68969114234.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/32402236600.pdf
    • http://mamnonkitty.com/webroot/img/posts/files/65821799458.pdf
    • https://mariapolis.es/ckfinder/userfiles/files/83592799242.pdf
    • https://tempegaring.com/contents/files/72658286029.pdf
    • http://biondiairsystem.it/userfiles/files/34519728111.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/zowepevev.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144448f3a650---kokakeriruxar.pdf
    • https://bushregenerators.info/userfiles/files/kidasogasef.pdf
    • http://mtreurope.com/ckfinder/userfiles/files/47650274262.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147703b98151---vorewaforinoluvidonis.pdf
    • 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_off0000ddfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 16792 bytes
font_01_sfnt_off0000f612.bin
c884c66fb5c2dc2e1d42aaf149825d809d2377873d7d8d33197fbd2ee2de8aa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 10932 bytes
font_02_sfnt_off00010f4d.bin
79655330ace7cd2deb05ec0d17847d41deb74521bc63a63857bfacd5016f5c11
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 17604 bytes