Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e90b73444a64b66…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 07:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28d1991be68b7982ff382d28ca885d0a SHA-1: 8ea2c2e7f8db1d8098d6b0a7266c5a7adceb3601 SHA-256: 8e90b73444a64b6689c9f8569c8b896c8737b447606e2ec846d405420ecf810f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to various disposable hosting sites, likely to obscure the true malicious destination. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=aplikasi+ps2+di+android PDF link annotation
    • http://baloneacessorios.com/_upload/file///28588225905.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dmng367vofd7vj8qmjqnr7k79d/33935243568.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/wumidulub.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/78521168879.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/47086776190.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b3367e4f---dezoxixipixilojivudor.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad50c3e691---65516271139.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/lofaruwegelixisuve.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/tuvajebujo.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/pifezenurisizavip.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/rexirumugusevunenaroxez.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/75358482837.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/41451989088.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/26682737701.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/ropawelorivusiban.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/zotagikelenivijakesawove.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/57231894726.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/3224637657.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/13056047272.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/parukibubasozu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136fee69d3b7---51573934471.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/11068362845.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/xolewutorikefal.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/guvudulajovakipupowad.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_off0000b622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE34 17312 bytes
SHA-256: c9132bb3114796ca38157c159d2f00a7f63c33accb83041230ed904ad408449d
font_02_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 10348 bytes
SHA-256: b1c247cce93a338a8ee696787bddf50e5c436b3b10cdc43ab2d733789d9c0a7b

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