Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b1303beb063bde…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 06:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 194e886f59fa6d2303f84630534d6c46 SHA-1: 400b5c7bda2c3899e047f217b3d826515a4c707b SHA-256: 25b1303beb063bde9bebc3d9bd0d440e6fd331356fd1688e278b7e9d9cfc7c17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or initiate a malicious action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://kitapkapla.com/upload/ckfinder/files/9941539988.pdf In PDF document text
    • https://suruburi.net/mm/file/20774061577.pdfIn PDF document text
    • https://esz.jp/img/editor/files/83890928909.pdfIn PDF document text
    • http://jar-ted.pl/file/viromu.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/putasadufikopezi.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/nisofonujibaponalevon.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/vivaze.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/sizepoxafofokived.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/vavubizizunanapivifubas.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/japiwejopajejobepon.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133960af2acf---popakoz.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/78364658691.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/midovobigefi.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/bulixexamokarare.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/lalajelikofunew.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/pijagudegoxupoxezasixa.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/35b02eb85702afa7b0d7b1217beae0ac/15507053542.pdfIn PDF document text
    • http://juentai.com/userfiles/files/wupenigutupi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347ea765c47---74510999867.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/makebupepaniwidegibor.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/85798541776.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/22282106173.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/remig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=deck+building+games+iosPDF link annotation
    • 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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 10848 bytes
SHA-256: 3f9485c3d2c1bcb733fcb48a9f05a8850b3266ff1b9af008062c276df0270a15
font_02_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16940 bytes
SHA-256: 845ac205a6c91c0895885195517718b3d46d4685b5d3c801bfea6ca045fe8b9c

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