Malicious PDF — malware analysis report

Static analysis result for SHA-256 1577ed50706365ad…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 00:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed29cd5c19a78cd34e216490368cd63a SHA-1: c112ce5a746fe599200ee0dae67a25c09c7e2254 SHA-256: 1577ed50706365adb290bcfe4d3218a424f0859621231e44e569c7255be9b61d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'SE_LOLBIN_RUN_COMMAND' heuristic further support the classification as a malicious PDF, likely used as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://krisoc.ru/uplcv?utm_term=file+explorer+app PDF link annotation
    • http://playonathletics.com/userfiles/file/83610993531.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/sizazunis.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/rigewosofogivukegawuleze.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/96256984309.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9f4e8574b210619d37717f418d6b3f3b/20542803381.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/wigizalumuzumumor.pdfIn PDF document text
    • http://hisunnychem.com/upload/files/ralagesefexafamemosibusip.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/66124526126.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/55b70e1136cc96c603529008e5b42286/83327031310.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/juseravorebaludujetoso.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/33419018785.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/93644457567.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/11/jonitanesiruxorugiwin.pdfIn macro / runtime command snippet
    • http://eiak.org/upload/editor/files/kisebizagife.pdfIn macro / runtime command snippet
    • http://draftingfloorplan.com/ckfinder/userfiles/files/wogarepezadoju.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sibonuvifafarifamekot.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/70408002151.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/30466861948.pdfIn PDF document text
    • https://blugarden.eu/file/lujezulodavanipa.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee587a4d0---45446145310.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/25306713717.pdfIn PDF document text
    • http://afghansolar.com/In macro / runtime command snippet
    • 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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 17868 bytes
SHA-256: 1c865e53502a49d0ccdc7e39e5c69522341e358555d0188612c9a403c874a418
font_02_sfnt_off00012f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F30 9952 bytes
SHA-256: 62f5559a93539356ffa090dba4ea4a543c8b26bd74931d9105e75380ea5f64d6

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