Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7cfee956e88284…

MALICIOUS

PDF

73.4 KB Created: 2021-09-14 08:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d74279a74f4d01be871a040624e770e SHA-1: 1fa462eb0cb1114cc99ef5e52a161c16489bddea SHA-256: 7b7cfee956e8828443abefdc591198e0a0b005a9b865e119b7ec4284cf37738e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://crysiq.ru/uplcv?utm_term=best+offline+story+mode+games+for+android PDF link annotation
    • http://najlepsietorty.sk/uploads/fck/file/77245974824.pdfIn PDF document text
    • http://360global.ca/userfiles/file/43129080795.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/bokiga.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/topized.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16312781347858.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/5965462296.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/99786937253.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d26641546---kaxudixasomoxibi.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/59871526075.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/zepizokizonujiv.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/77066810461.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/85953000026.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/41822155688.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/36694599502.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rhvg9u8st02dtmrjlhkutpltpa/vozig.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/48396123080.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/renuwu.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/natejinatofajutozi.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/sememe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5h93gvn8ibdq2mui8vvr2vsal9/defuzulupefimerobidotar.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/72372283005.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/18e951a1e474535dc1067962c9be5482/dovituzevevoz.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/36043843397.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/nafalesiwetodakife.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/34319323773.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/purojovipusatixoboselok.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9a2ef0ab---jotifavadatomipatudixaz.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_off0000bce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 10864 bytes
SHA-256: c8f748b7afcd4ed099851d06e4be3064aed743efbbd87245b5f6b6b130363384
font_02_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 16400 bytes
SHA-256: 2d155116b43e98417cff9038f448494267646e7740ca5045f72947f3f584e3f4

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