Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b3e32d83fca2fe…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 23:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8bee6daafb4e70320af190e76d8aef7f SHA-1: e527e3e16058817e4fc4b05326b481896cee33cd SHA-256: 85b3e32d83fca2febe2d605caf8564e35ea9638ba458247761e06d08d34b4d43
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external resources, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://garglob.ru/uplcv?utm_term=stickman+dragon+ball+mod+apk PDF link annotation
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/tepaxofavuvojete.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109072148302556.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130adb06242c---zexexafeluwuretob.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3oinh30q3nfos1nsvubnnq99if/powipidefogejozetu.pdfIn PDF document text
    • https://bunianco.com/other_files/File/raruwufedogosemaj.pdfIn PDF document text
    • http://devveb.net/userfiles/file/67107870787.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/dozixugutupevik.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132caa709985---xaperuwamokofedezetu.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/30956651878.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/vepafabexokivoz.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/tedububutixod.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bdac86f8d---niponabogemapuzitasitixad.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/44889050619.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/iu5r8arpeum6ldho9of4gsq4o0/lijikemekotofutepux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fabc3ae9c---rorekilevawepobulomidi.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/10403471231.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/guzikagizukapazo.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/jimatopawopimuditibepaj.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/22322489930.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/59209500766.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/91692623369.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630449080/files/pujaretizajif.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/87653280533.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/97708862550.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/kagexozasasa.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/kasunafukemirabewe.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/kabevafude.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_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 17840 bytes
SHA-256: e83fd46b65debcc45c14f8ee736501769b8294034a600d4da5be850aafa9b5f1
font_01_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 10864 bytes
SHA-256: 5be9a761e28d6c62931612353167343bc647ba43141c9c701a91b31279224e17
font_02_sfnt_off00012611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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