Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e3b8431597d9c4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 05:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 431b3778c8d6cbbe36c0121aa99e4fa5 SHA-1: b3111a3fae995043306ed62bb33a0decf241107f SHA-256: 40e3b8431597d9c45bd99f2575b00a2cb9d296da8094cc9960518c1d01975d06
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The PDF structure itself is heavily obfuscated, and the document body is unreadable, suggesting it's designed to exploit PDF vulnerabilities or deliver malicious content indirectly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://itps-group.com/uploadfiles/file/52207090376.pdf In PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a811288ec1---domovodufabebafasovixa.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210910060035.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb722ec373---60169002413.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/18814501554.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/52447409336.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/11213630623.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/54850718055.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137463df0847---xaxufigifurinonatup.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161363ba4bd8b1---71731605740.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/93609876176.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/72194633665.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/68398196041.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/36721344280.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/18839381580.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/jujafivitijosakolibew.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/xesugila.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/94580970408.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c9432834---tibotifimufabawuzexik.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/46069066885.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210908082454.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/72420953199.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/gowivupiraji.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/niwakiluritiwigoxu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613176b5a35f9---kebepipumupa.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/lipegikigarivavusuvome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=smart+lock+on+android+phonePDF 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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 17656 bytes
SHA-256: 2285cf71c942404e6b8d8dda87be406b764adb7d732b4ba8db76f93301df832c
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 10776 bytes
SHA-256: ba16a7d8e5d1535e8fd89c86d2b74aaa2a5840be6b81964087d3610d36e78791