Malicious PDF — malware analysis report

Static analysis result for SHA-256 edff283cff0f0ff7…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 05:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3807658447face7b7342196d26d2605 SHA-1: 8c6938be6f7261cfcc719b3cc480769a18e1e609 SHA-256: edff283cff0f0ff7f297fa6472fc49129d7d90668a6777f74e05d2160d19e86c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to compromised CMS upload directories and forming link farms, strongly suggests a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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.
  • 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://wastran.ru/uplcv?utm_term=are+androids+or+iphones+better PDF link annotation
    • https://thisissati.com/userfiles/files/11072149859.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/57523386258.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6046741e8---29939698974.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b053daa44f---74129635876.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/sobekalopitajukome.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210904_22318E0AA29C74FA.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/dajaxar.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/derigazutusumej.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/tipitorejorelazodavawuge.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/jukofabotofatizuwuxona.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/21563682193.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/ramubafutivuzalux.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/pagaliziwelepad.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/loguduluxugusedofuj.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502acc0503---tujubelif.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/fonanisajuvopajisidoj.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301242c7611---wipurerukemamemidelebifol.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/45426605299.pdfIn PDF document text
    • http://gespk.com/userfiles/file/gawenimibewelelewexe.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/guvanoliv.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/kanaxob.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/88850348447.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/1504411258.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_off0000bab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB5 10564 bytes
SHA-256: 86f8526e70f0290ec87c4a2a5bc8a5020af987ee1c9e35e4ce18b324b3715d52
font_01_sfnt_off0000d275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD275 16608 bytes
SHA-256: 29d436e97e8d8405fca5e03bea33e17ef04389f369a8a4cdb5e0475845587e74
font_02_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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