Malicious PDF — malware analysis report

Static analysis result for SHA-256 df40123097e14304…

MALICIOUS

PDF

77.3 KB Created: 2021-10-14 10:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f653cb21a2606cedd65c1b3e600a7e4e SHA-1: df0b46b01294e03e6031e798d29928a26271a8ab SHA-256: df40123097e1430410caafd7ccbaf58b5e21c1ad408823f01b26a317e4bf358a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS upload storage. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://studiocommercialedelpiano.it/userfiles/files/65965303307.pdf In PDF document text
    • http://phelieuviethung.vn/upload/files/52890841376.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/93884834476.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/fipapa.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/55272781788.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d098edf36---74277184121.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/15976727183.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/75603527912.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pusofixerotoxowigoniwedid.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/88970477292.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20211006190102_1368849461.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d471db24---13286763437.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/tawijejanolibonelivu.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/6191427924.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/79026743046.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2b2442ddf0fcbb0ad7347ac6c9580e82/29247021409.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210928190024.pdfIn PDF document text
    • http://nyirfa.hu/uploads/files/savupedizuzazeb.pdfIn PDF document text
    • https://matricula.hssanesteban.cl/files/juzimexezo.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/bopipariluv.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/98052744400.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/wazonifuzofedafuvilovep.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/xakiditafa.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=wipro+written+test+questions+and+answersPDF 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_off0000c80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 10664 bytes
SHA-256: c061c78394450e6abf2f5b74475c1efc28ed358b0d1071554259f11b9e06a12b
font_02_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 18144 bytes
SHA-256: a1cf097698a6a5ee291a6f6e7d04e3292d1acb107606f51ef49572031f224a52