Malicious PDF — malware analysis report

Static analysis result for SHA-256 68544b037dec07e5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 00:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb0aa4cee953a7e964302131a6d027b8 SHA-1: 75a32e0970785ca6a6555d931391a1cfe771d81c SHA-256: 68544b037dec07e5f1b2cfc0dd1f35c7caafb4149f1e4701fbca749aa6451578
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 it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwallendorf.de/userfiles/file/99413921231.pdf In PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/47080602720.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/29103379414.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/6699951183.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/82733321368.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/duxotijepad.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6aa500c595---rutujejusipadevuzebut.pdfIn PDF document text
    • http://coffee33.ru/archive/file/59735634377.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210803_115700.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/d02l59gv0and4sn0jnfg81eu50/dapubetevojafukigeximo.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c25315b3a---61430900857.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/70708610676.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a590dbfcf---27164631671.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/xopixebiwenuxonilexe.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/92438676365.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/dce49e15cf6e487c2513a78b899c8a2f/lenumivatiwitatanamukikiw.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/20044613309.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e1da2ff8337df2ad2bf2e0942542ae61/73023234222.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/3b6e9500703ea0799b5bdc35d8dcfb36/mipawokusezoz.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xumafefopilezuxotek.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f1ae962ab4a2df020af19564d9732679/87327150605.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d95c2067257---83960229164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=online+convert+pdf+to+jpg+200+dpiPDF 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_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 17196 bytes
SHA-256: 3a043f4126fb9d633dd8dcb0825307f439517e4a18199e06d02042b6a489e6b4
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10928 bytes
SHA-256: a3374c423c17e4c255e9757cec12992bcdb0b0eebb5a6fd5a9db4d0e7da802bd
font_02_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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