Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e3a794ac71cefd…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 21:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ae429d36fe97b20164633872bd6b12f SHA-1: e8d38d838d0131821be426c8e19cf67c1ba8dd35 SHA-256: 36e3a794ac71cefd5eff3f35db78839e878c6357b816242313b84310104fb213
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many hosted on compromised websites, designed to trick users into downloading further malicious content under the guise of a PDF to Word converter. The presence of a "download button" heuristic further supports this social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9706d2a9f---829310208.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d6d1e898---xijavogofube.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5d3090866000302c93cbe86e8c460c56/78756509813.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/rejolifabijedo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8889d7d0---kubez.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7grco38heeln35sfaqbquq9okq/91198970619.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/vugefe.pdfIn PDF document text
    • http://wphs67.com/clients/9/95/95f8299e8098c1f2c85aab0f7ead5e97/File/61337180705.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ee352b87a5309de68a4496f8cab02f95/64636765295.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb85661aca2---torogawavikebuwel.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/pupotubi.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/64880416469.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/zesowofevebot.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1065472914.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa4498d18---7128131403.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/89353957608.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/dawufenedupajinafeko.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13e545bb1---kexeloso.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c601c7397---37886405475.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/jibegofiw.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/78819188474.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/wifovu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b287a699933---guxig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+pdf+to+word+doc+converter+code%2BserialPDF 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_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 17592 bytes
SHA-256: 3e36beb4122bad0c7909b2c6ff0b5027dd8681201ae58fbc57e6e8c6172d6662
font_01_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 10744 bytes
SHA-256: 4ce7c17bc37adf8c0ffb80f444f3b171d8ee0f13c6f0fc20fb2d7f8086b7817f
font_02_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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