Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c45af27fa333ad6…

MALICIOUS

PDF

99.8 KB Created: 2021-09-16 06:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cedb3efd4928f5be9821f2886a39928c SHA-1: aacc6808981cfaca5d8c7107e14da6d56e0519e4 SHA-256: 3c45af27fa333ad6f032230244f445a30de087da1c5b00f158c3fb24a166c328
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to host and distribute malicious content. The presence of a visual download button and the ML classifier's high confidence score further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=in+the+room+movie+download PDF link annotation
    • https://gtijsr.com/userfiles/file/segerofupunitowogukapegij.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zasalusonotofeloxaripu.pdfIn PDF document text
    • http://canadanur.com/resimler/files/zamozim.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc548bef5f---ridufixamanuxisodego.pdfIn PDF document text
    • http://esistore.com/userfiles/file/27884615897.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/beguzuganisago.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/53638088885.pdfIn PDF document text
    • https://inarsindbari.org/uploads/37007592709.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/10245127884.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/buravifegugaxijevujidokad.pdfIn PDF document text
    • https://aneri12.eu/res/file/64743572918.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091016464595.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/wivelalosapavotuxopupituv.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/tufalavewerudadepage.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/707d829284300becc3c0b7f6e9aaa6a8/gupilijutunutifenozobus.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/rukasajewekux.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/tilolivixezeru.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/dedulaxawusam.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce55970623---patav.pdfIn PDF document text
    • https://blogsma.com/files/31833227801.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/3342220759.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021982249468407.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/rikeb.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/xoxidekupamukuvomebugoje.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/50755591534.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f70004d64e---gidomedig.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_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 17460 bytes
SHA-256: ca79056348010120278316af746802355374f774d0f39a5997c41f193753b0b0
font_01_sfnt_off00015183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001699a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1699A 10448 bytes
SHA-256: ceb7089937f2d611b2f4188e9eecafe9bf4ed5d88e3aa648d6831a6786efc5f7

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