Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3fcaef04323b1d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 22:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb2fab55a5192ec02dc9201f35c837fd SHA-1: d2309823275a15e1871b171e5e22c303f9c6a129 SHA-256: 3a3fcaef04323b1d87d536db083f253aff067805cd726550f59965955282ff9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=the+summer+i+turned+15+movie+watch+online+free PDF link annotation
    • http://media-production.net/admin/ckfinder/userfiles/files/vanubizelanenugexus.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xovidelejiripa.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e1e2e26761794a6427562e133b5608d0/49019620481.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/sobabiraruwubazabisotewap.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/sunaxisevoloponowodeloxo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133329eba809---rixewolixutemumot.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/8767824600.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l5lcqgljki300og5k53dkmi2uu/jumibifikenajovekizagove.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/61829729374.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161416349b821d---zilagojapasodokuro.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/26427201682.pdfIn PDF document text
    • http://zeci.nl/im/image/74359620531.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/82547154589.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb0a532a3---14479319078.pdfIn PDF document text
    • http://net-work.cz/data/file/pivujobe.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/nekigewiferomonefoxedapaj.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/dexofetid.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/vanozipunomenimeto.pdfIn PDF document text
    • http://med-os.com/user_upload/file/juzusobovebojevi.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/81917261392.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/7210998885.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/mabibax.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/12286084410.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/rujibolumiwez.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/tufigumisilijesi.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_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 11144 bytes
SHA-256: 0c0c990d38e8ecff8c65c0447aca2be3cfbb56c50fc3f2072a4a2c2eb8b589a1
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 19592 bytes
SHA-256: 66a119f85151720c69b977b9188982f0c595ef28043d31174848c2dd4d60e3a2