Malicious PDF — malware analysis report

Static analysis result for SHA-256 518d9dcd0f76ac82…

MALICIOUS

PDF

87.9 KB Created: 2021-09-14 18:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d49095fcdaf8957804806362844b1773 SHA-1: 013df4d502146a609fe2bd866997d047e9e8d67c SHA-256: 518d9dcd0f76ac820a5490b678cea22e5bf64c65ed51516e69475b2f3f5a265e
156 Risk Score

Malware Insights

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

This PDF contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the heuristics point towards an exploitation attempt, possibly leveraging a PDF vulnerability to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=game+changer+alphazero+pdf PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e01af22ca---27220430512.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/51932907013.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/87571130333.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/valufuwul.pdfIn PDF document text
    • http://travellerisland.com/files/66519958084.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613849201501a---28797994533.pdfIn PDF document text
    • http://zzquansu.cn/d/files/33821486915.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161339447c1120---dijegunomolimukezabo.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/88904882976.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/99184757905.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/77365664404.pdfIn PDF document text
    • https://redac.ch/upload/wamikogi.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/66539702313.pdfIn PDF document text
    • http://torgoborud.org/images/file/kirepisibuwajorap.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/10462931905.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3bbbb798---25425211272.pdfIn PDF document text
    • http://thegioioto.store/upload/files/65590972627.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/jenasifovifi.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/xarefamegivazabol.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1357519104612eb3f64fcf9.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/53683207407.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78f2aeb42---sipinagefezogotemevadake.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/41332302056.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/50839934708.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_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 19228 bytes
SHA-256: 9b8a8409b271f29022cc898937a973867189fb7c5fee7dfa39e1545d669ae270
font_01_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13926 10808 bytes
SHA-256: 23bb7ce90eb171a069f8ed3e837a6d0d258c999f5d22e5b6ec0c3495e81a9c5f

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