Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc016c3398becb8…

MALICIOUS

PDF

79.9 KB Created: 2021-07-31 13:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b19598b2706def9516284e5931e77d96 SHA-1: ba4c76f64f256118c187d6218f62e7d3568934b9 SHA-256: 3bc016c3398becb8aaa9d70e863a494a5283677205527ac632725090c9886d67
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution vector.

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://mcenterdk.ru/fck_editor_files/files/48541720639.pdf In PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d390cb0ef2---99831236422.pdfIn PDF document text
    • http://seamacros.com/upload/file/bulukifowogopiwagu.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16102c9a62b1c3---72852806829.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/xigafi.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/vamat.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/uf4g6ek93ahfirrg5m395rlk9m/89773002401.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/29537442594.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/sesenowanajeder.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89188497591.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/purufonarare.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/vibemesexoba.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/23954566589.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ee41f59bd138f38e201863d34f795949/pajelejerokudijoz.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/l68csta5ab6qjmk4dku9cmspjs/xiderasixiragowonaba.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210706_9D14A71A801F418A.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c204599892e4bf84ae40215e227880a7/rejugotawisobete.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/abjbbh7h469gke0r3rsu69nk35/sawixuzuwowepanedo.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/37180867581.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d41a1ed71d---93894202280.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/64551275937.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/43494520076.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/8e5b030f83f416a61d79d4e69748cc49/mugomojofivukovuvipupu.pdfIn PDF document text
    • https://gilbertems.com/videos/file/fezogivem.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c629ddc329---vezobuwubawin.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/gubixewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jojo+tusk+act+4+chumiminPDF 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_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 10608 bytes
SHA-256: de9c1eec969564a3e48acf605d6c3a7378ec19217c6dd94220545dc73b455024
font_02_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 20472 bytes
SHA-256: 28cfadb195cd0441eacf5b2b01e64843636cb063895d12e51f3a00e10c735df8

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