Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a17758f885dc640…

MALICIOUS

PDF

90.1 KB Created: 2021-09-14 08:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4e5b43e816dfe6746cbcc83b6a12dc7 SHA-1: 334f6a6c5d82b2e0eb0740ae76ed5d72ce6a9f41 SHA-256: 7a17758f885dc640cf6aa8fe4d1fb62194a5cd3d13880d21fecbec4870a89b7a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links align with techniques used to lure victims into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://cochleartudaskozpont.hu/files/nobatazum.pdf In PDF document text
    • https://machnhaduong.com/images/uploads/files/najigezisejipevibi.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/48148709596.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/36914521383.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/57eed19c2a31d5b5dba6d968e0a3f09d/32005155725.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/85478237306.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kebirafifugafonosak.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/vufezugawususukogura.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/27146135502.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/afdcd4be6a19bdb0943c423135c184b7/45685952338.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/wenetikobimebigono.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/29256452116.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/38105535756.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/17394006666.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/fileguwuxojumoved.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c3826b0f1---xijuxolurezobowizik.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/10448278726.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/71041126043.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e4d0f184---77566894470.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/jozakenomutivimutaka.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/zosaz.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/kamumetikavuremafukesoxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=butterfly+text+symbol+copy+and+pastePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/gijujazopusepanenebofewix.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014067.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14067 16868 bytes
SHA-256: e85602c5f1dbe9f2a0193bee55c1467134409f9f91a89be61e5101d2436be3cc
font_00_sfnt_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 11200 bytes
SHA-256: ef6a706ca920de7e5f1f4a27bd04511120e2f02c1c17d03fe7f5a09b0d50010e
font_01_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 25008 bytes
SHA-256: 64f9c524f4eb8ef369052448015cdc9da0dd50c7962199ceac5cb3e24e44fbf1

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