Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc662ed7cbc7230…

MALICIOUS

PDF

75.8 KB Created: 2021-09-22 21:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3564a63b34fbcae8af53b44e8be69753 SHA-1: 19b4920f90788fcabbddcb347c654f3e2b0a409d SHA-256: ecc662ed7cbc7230ca2501023a3f06d2825657c41c52f85eda10597fd2935e9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, but the presence of a link farm is evident from the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=pokemon+platinum+randomizer+cheat+code PDF link annotation
    • https://bakotech.at/uploads/ckeditor/files/vigutozigusijuk.pdfIn PDF document text
    • https://linker.tw/files/rukujotezigoz.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131232fde396---zevibogewob.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c64ef5af5a4febf85f08ef2e4b00eeff/kotofezamurajepitis.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5d5c2d90815e5e7effc5d5dfb4c2cd87/renugagoziwumaxamopovubi.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/30736194293.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/46396684940.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/fegibewimevofopamofedadow.pdfIn PDF document text
    • http://kes.org/upload/editor/files/85007777403.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e554b02e9d1f709c9540bd772b162b42/97770888235.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/83565637892.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/60363823481.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021914728127177.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/9253491669.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/44564274210.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/13650866277.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/33824271702.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/71599698480.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/midubaxowezabatemuvixero.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/zevetutebuxolosirivugizoj.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/tirak.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/jogutaratog.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/suresarusojujivup.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/sazeze.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/10414888179.pdfIn PDF document text
    • http://airzo.net/userData/board/file/lefowuwafiravezugiteb.pdfIn PDF document text
    • 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_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 10864 bytes
SHA-256: 0202c9873889c4e36b5adddb19d1abaa749131490ab62f7d19de0d327593ca02
font_01_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 16728 bytes
SHA-256: d4ed44bc0aaa9285cf05f6299f43803b6232a9498a42846aebe0bfafb89634ac
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1