Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a21099d1b3a570…

MALICIOUS

PDF

123.7 KB Created: 2021-09-04 19:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec94d69dd5c29abcb187653acc0d5fd7 SHA-1: 2c6e3a6b5455097c8f090b97554cbe91ee5d6ef9 SHA-256: 18a21099d1b3a570be03afb89adb67dbfcf7a6a6ccc3f164f2bee80d96336327
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure is characteristic of a link farm designed to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://g-shocktou.com/user_file/file/vazuveka.pdf In PDF document text
    • https://parc-hotel.info/file/75561519490.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e06009055---27424086539.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6891f43daf---jojopejewidakuzovusipokow.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/dt858gl79f7mbge38k07cp7t2j/6620303037.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210829000350_306573328.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2237c2a7---fusulagevajaxalewadafezil.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j2unu2v6d9iqt0cnou2i9mu7s7/tibuxedulukomeb.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e19088c32---fewalovotafonetibofisev.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/76526589249.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bc1c803a5f9b8a182de89b6fcb66bf18/92628507481.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/6279705025.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/84341feec488ccbf6d6bac090b44d466/73321896689.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/96018190640.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/lidugusixut.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/razuvanebon.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/78766877087.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/tipowijexojilakebobutew.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/12967789242.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/delupaf.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/85114737826.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/38855749358.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/50761094923.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/nazusudolemidobuzogik.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/pizugupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=les+proc%C3%A9d%C3%A9s+explicatifs+2as+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_off00016abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000182ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182CE 27536 bytes
SHA-256: 26441ef4ada4f49af012905c8ce798e12b3020066a2351df0214c8cee0e0eec5
font_02_sfnt_off0001c5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5AA 10844 bytes
SHA-256: 607b005cbde0fe3101ff20d5a82ac285bf48518e58907bf7c44a6602c89512f6

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