Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1bfa99de8c9174…

MALICIOUS

PDF

70.7 KB Created: 2021-10-09 06:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 52b197457b2bb1d3a587757fb89e9254 SHA-1: 0782729f55757082405af78e70fdd9d6cd0dc250 SHA-256: 5b1bfa99de8c91741fa6ac8da928a7bc3165f6e6ba30459a308fb9d6371fc175
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports the idea that the document is intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pixomot.ru/uplcv?utm_term=airforce+group+y+paper PDF link annotation
    • http://otestmanager.com/club/data/userfiles/file/20210927042024.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/51896725168.pdfIn PDF document text
    • https://lorrainezammit.com/files/file/bafofoxoxi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2e189f6c---nafafodesoniju.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/72642832315.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/sujatexititijogokagasulij.pdfIn PDF document text
    • https://trainova.com/userfiles/file/84125436517.pdfIn PDF document text
    • http://darstin.com/userfiles/files/piwemodubunutinebobitew.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/41289049340.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/4knaueaaj32ke9693tmrkmurm5/nozavafudujide.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/14170359604.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/takafokokivever.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/59609546316.pdfIn PDF document text
    • https://polytex.de/sites/default/files/46913841056.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/dujili.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210902_D2E4C745E5709B1A.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210915153449313.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/97941166611.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/tuvupoxepoxidajuzijedebeg.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/16972947297.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/1009054212.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/5mft9sk37tlr882d9trnd72okl/nukafirerazabasukeso.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/vatefepalokopivinawaratun.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/dikab.pdfIn PDF document text
    • http://lex.tj/img/file/sodiluvavip.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/27570158000.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_off0000b6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 10436 bytes
SHA-256: a665124b16958682e48d97c13bb124faff17e1ca4699c302284f9f64a7f3cd86
font_02_sfnt_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 15252 bytes
SHA-256: ac9f9143088bc92f0aca6516707e34d563dace3227d4f58378ed1c66d4ea877f

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