Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09415a017f48d8b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 09:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a2449bd96c1d0a640d2a305a13180a5 SHA-1: e62141a541b55506d0b936b2a6825545d7f99b27 SHA-256: e09415a017f48d8ba176b80b1e812c6435dcc4f8c6c8f2cac43e5f157a40ff05
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://advantagelic.com/singhania/downloads/file/57621747366.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df68d6a1ee---38769641339.pdfIn PDF document text
    • http://livilgirls.com/files/jikagivikumodopuzimemuva.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/nejexejidelu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/08d84a9eb047a52a673c30ae1f25c66b/1016959690.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/71466008863.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/39496676638.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/28552415894.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/46551822538.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/kavejelopenef.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395f557c8e3---44363294377.pdfIn PDF document text
    • http://espicycooking.com/files/file///suwizedigenijejoxofer.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/webobikopofaz.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303fd421738---mebudebexuxa.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/zodijaxikugulabiwepi.pdfIn PDF document text
    • https://yifff.se/userfiles/file/vaxekofopazikufojokenerit.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/nabodifebegaxakopup.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/pixawomumes.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/nejipabevuganevojokib.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210906173320_762918564.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/96740378950.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16326295709114.pdfIn PDF document text
    • https://breedlife.com/upload/files/35622566200.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/fasemupawowup.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/dudupatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sync+365+calendar+with+iphonePDF 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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 11192 bytes
SHA-256: 1f278c27f63651cbeca8a27660746db0fca8be7acf690b01b870c5e30c609829
font_02_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 16340 bytes
SHA-256: 5dbcddceb4c7fde7fce52c532f406e3d77289243b937f80ac7c8469be0f3ca8c

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