Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d191c30a82fe7e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 17:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73421da4f66f671897da7889dbb2b1db SHA-1: c74975afe8ac04be298d373b1afee03a7f61d712 SHA-256: 90d191c30a82fe7edfe950fba9b71880f61abcbfe77382ca42e8d3f79f9436e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that point to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mobilni-kadernictvi.cz/files/file/3171732614.pdf In PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/sulugavalamolufowo.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/bolusefuvaxebino.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/8429987567.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/fobaxojefono.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bace09b7465---vagujapi.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/803f65df5f96d149927efdc42dd73cbe/36289092719.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/panuwinenokiwerefijamab.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8750ad7bd7---13711551682.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/96650408937.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/besujelasoremegim.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16265569004062.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/58076949192.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/61834880525.pdfIn PDF document text
    • https://medtek.vn/storage/file/sefabopetomekukifikeb.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0b437007---94143291287.pdfIn PDF document text
    • https://shiokerbau1.com/contents/files/tumireromoxilivedad.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/dd690a8154f1b8f4c449bbb8fca5e42a/74361524223.pdfIn PDF document text
    • https://tempegaring.com/contents//files/semisimunuvug.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/walijifupimutar.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c0846fd2f0da9fd47f2da13344129f19/97225288654.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mr4i1k6hg0uk3jlnbr6bff986d/nekovip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=daily+conversation+english+sentences+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_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 11080 bytes
SHA-256: d7f8b3556d97e16854c33ad21db47b42e5ebcb8fb6b49bd2ebe49a49bfa1012f
font_01_sfnt_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 17868 bytes
SHA-256: 160ec7d35aed50d56c08077c8138256fd21bea05766f0a2cd386936cf987b138

Open this report in the interactive analyzer, or submit your own file for analysis.