Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cc9a05035a74d9…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 02:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 95e7a2f8f1488f72296a851ce1e58d46 SHA-1: b4c601834c0b3666aa64b4ac2f40d9297f9eed8d SHA-256: e0cc9a05035a74d9ab244456ea6b908f5dd40c284b58b9e579a741220c2be7d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. This suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://jingchengs.com/jingchengs/ckfinder/files/20210623190214.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/kotonixedelidikujib.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90313e64a---45353631327.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/19ac8a0fc74b81bf40bb0e9091e713ec/75849638450.pdfIn PDF document text
    • https://aashianarealty.com/file/viwubowavalovutusagogidij.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a08f029f560---kavodaxetejaporufajenajit.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/badarurelevoradunema.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/25234726.pdfIn PDF document text
    • http://wwstationery.com/files/file/xididiguvufove.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/tatinekewur.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/26ea43706883a291517dd1fbb275ec27/62557999144.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/297e95967dec0b9cbd526ab1386f804a/jevemukaxedadivawose.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a848bea33---tetupuwowes.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/fruolqnh18pd0luemlc347mcij/49997998119.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/roxamijekofofolazok.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3d9df6e4---zavoteke.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kjcvsivufehnl2fdqb73kra7q3/xagepa.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/datapi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a22e7128---depusijeluzur.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6155b9f0---xinoxovif.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/4jo1u9iups0houg2oejt3m8u1c/pizoduxaroripeb.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9e67d927d2129bd3e697773b0129f8cc/68174904724.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b09d6c2ca7d---80312769535.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/30212349577.pdfIn PDF document text
    • http://kotolantopeni.cz/file/34598399868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+odyssey+chapter+10+summaryPDF link annotation
    • 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_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 16760 bytes
SHA-256: 13823f309962db3480b8ac99f17c73c979146438b365fc941522b38be9e30302
font_01_sfnt_off00011aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BD 10888 bytes
SHA-256: 09f38303f63783bc02fa506928a1e167b527de1043d37c39d64cd73477c178a9