Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bcd3f6ad45d7b6…

MALICIOUS

PDF

103.8 KB Created: 2021-08-14 20:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1bc6991692119858f228cae9e0f85df1 SHA-1: b7fa3d6bc33a955e1031155fa52de8932af516bc SHA-256: 32bcd3f6ad45d7b6480302ddf26202114bc306c4022849dcaac0968ae76e9ac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous external URIs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://tz5168.com/uploadfile/image/2021/08/14/file/20210814_161946_155.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeafcad49f9---13259089953.pdfIn PDF document text
    • https://parfumzone.ro/files/file/waxobajebanix.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/46892527005.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a252e73e0---51934711285.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/54367278524.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/788d852bb51091fa25b3f0c22e556770/gopokoganavi.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/12483309016.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/13841274534.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wofebakebos.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/likuxeropupelewulekomado.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf08228cd13---rofibamix.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877401a7b04---87684147375.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/noxenezene.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/64603773856.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db3cbdd412f---14865975860.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108121929173420.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/mizewanemoxunoxegetut.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d4856f089---fabigu.pdfIn PDF document text
    • https://t2sc.me/userfiles/88614383574.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/burajuzusazofoxefavuwuve.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607902b414c2a---bimanilutezumexasozivuza.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/jokujafekorup.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daf690be48b---vajobak.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d14381f194158de06c24f7aa629e9a60/25975059265.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/jinenavitipotifaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=libro+de+espa%C3%B1ol+lecturas+segundo+grado+de+primaria+2018+pdfPDF 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_off00012ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 11868 bytes
SHA-256: a04e100be03cfa853c6f6b60c9d44040741e526251a3c9ffd74317b143330028
font_01_sfnt_off000146b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC4 18556 bytes
SHA-256: 36b54cba8a42e27b167955debf1dcbf383b1fa3e91cceb7e2561f907d3651f35

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