Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a8325ae7a7be78…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 10:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d991d67e843fbb13760365b37525568d SHA-1: a7ab1328b6ca5b93d635d026c12789f15f1114da SHA-256: 50a8325ae7a7be78390b50843bc14faba90ab2d9e07624294ff1277b39939fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards a phishing or content-luring attack vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://studiofantino.it/userfiles/files/kutimibasixajadozalaj.pdf In PDF document text
    • http://saaretravel.ee/images/file/vipiti.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/32606274451.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/bovasejobikeminuworalazi.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/51036451748.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/61094688662.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cac25137b---67251031886.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/safafematolexogawaw.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/lufuvasu.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/76301401302.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/manapogizogosuve.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/lumoneja.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/11611204640.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/fuzinal.pdfIn PDF document text
    • http://besteva.com/upload/files/39110827644.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109022243424213.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/buroburoputeg.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/46309280522.pdfIn PDF document text
    • http://honghuibio.com/d/files/63078450395.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/tufevibazufef.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/ligofapuf.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/dewisava.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902232427.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161404b1bc8e3d---53381493297.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/92063360026.pdfIn PDF document text
    • http://rc-modeller.se/images/file///jobabosomuromesasuvajelos.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/rubut.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613169fdd2ee9---gatuputofenajirusemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+robux+codes+2021+real+not+usedPDF 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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 18440 bytes
SHA-256: b94482aadff19a8a0c4d96bae58072d8383aadb2118c2acbcafd410fa5f75b38
font_01_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 10884 bytes
SHA-256: aa369550c803915f9ac394f8051ef62e3212663dd221320258dae5a5efb208ee
font_02_sfnt_off00012693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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