Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e79696c1ad14e1…

MALICIOUS

PDF

81.1 KB Created: 2021-06-27 20:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 34241bdf69f85732956913972322de7d SHA-1: e9d2fcbcec99fcac9ad042aa0c44a9c9281e38e4 SHA-256: 84e79696c1ad14e16d49c1910788444934a1b7c853140013633e3e8e54221236
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=calculus+and+analytic+geometry+pdf+download PDF link annotation
    • http://cipetbhopal.com/webimg/files/dawogonunikena.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb28383a8b---63702304984.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6ce10d45f5ff2fdbf2206287e2501b2d/86522996584.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/de819837b1980a1b8f56f12da5858a43/50103801523.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f560aa8755---zirezoz.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a5f71f9f314cfdb08f12c8847e4c58a6/85917967980.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8331534c768c728fbbe32164525c919c/gafesarag.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/vigodopaw.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/48619141961.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/46696554230.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//70224072048.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/90ab23e91c36f7878a70b1fe6da0bd0d/sogejoxepadu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ai9mr7ujgaipj0i7f36o2smkd4/21778433173.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8f9a2c36d05334114fa98cee25e7058b/fuxulinawiwiturew.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/vimuli.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/60543746286.pdfIn PDF document text
    • http://stevis.cz/files/file/9090215909.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/nelasarazepuxelifijelid.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/b53787021283be65edc14dea7385e3f7/xogejoduzuwuwuwuduletom.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/96704273726.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a6da2c4ecbc0c6d1a0a2cfd295223344/zawonigukiguzidugusagute.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b5a4uvai51gvtp5vch36v53fm6/soxunugipajudufoz.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d5e7cac6b---wisavemitopivigovi.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/72890114208.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf2349ede---novejudik.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-17/20210617142444316219.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_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 16704 bytes
SHA-256: dadaaf22da409a7e72bc168c54d6982f9abea3e436d89d7172c299155ea960f8
font_01_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 11292 bytes
SHA-256: 9274918b535b94867e68e0358e29907026c534009a5b5d535c6c3ddefee6bf4c

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