Malicious PDF — malware analysis report

Static analysis result for SHA-256 870cb700be6e2bb2…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 19:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad646e45cacc7e7a335e1c84b5ea9177 SHA-1: 9e9718fe495488d0f3651a912f27fdfd2d02d5c4 SHA-256: 870cb700be6e2bb2afdc06a6c9c039f8aaeca1d5974eebca80ec1facede3d5eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to direct users to malicious external sites, likely for phishing or to download further malware.

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 https://wastran.ru/uplcv?utm_term=quantum+mechanics+mathematics+pdf PDF link annotation
    • http://lateonsettay-sachs.org/userfiles/file/venun.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/87975477451.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210628172628.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/91159955790.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cb85221671990f53db7ec53ae687e22a/befatenoxobasoteso.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/51714951597.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/pubet.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/19442163037.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0a15daef3---39186810218.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922c2c063f2---janetinogopazimopisije.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/nawam.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/olsn9nfd9cjk5q5d7j9kte9h74/29080130218.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a6d296005---11138475350.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/98382783981.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jopudavobu.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjsrfdhqr5dmmlaqusiaru5l3u/sabanowegonixegemuvigo.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/vakilubipajakuzubitilikul.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ca254cef5---98227920370.pdfIn PDF document text
    • https://esvigo.com/upload/files/27533190290.pdfIn PDF document text
    • https://austarpharma.com/upload/files/46584356829.pdfIn PDF document text
    • https://ahha.az/userfiles/file/23875834806.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca4997563---83127165597.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/bisudepojesuxuzaropim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 17664 bytes
SHA-256: 48ba1d2adc7992d87816a35d90cdcb0da2aa1b769fd9eb071fd4db5e92deb357
font_02_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 10780 bytes
SHA-256: c4b14b209ec881f4d858a938920c6d6d32031b39491c0e927852cf5762b869b6

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