Malicious PDF — malware analysis report

Static analysis result for SHA-256 358d8333a819dc1d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 17:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 073656c847dd2a79bd60f36b247e481f SHA-1: cf3a03cee10d352331ba59604978525e3107809d SHA-256: 358d8333a819dc1dc8d8eccb843b5d1d7c29bf91e8e4287502207cf59f5c5557
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm designed to distribute malware or lead users to fraudulent sites. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=qr+generator+online+with+logo PDF link annotation
    • https://lbk-ingatlan.hu/uploads/file/66569104463.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/depewidariwatij.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/91788837521.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/31569914388.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109051946356207.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/dekakulol.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/232853570.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317b65c4c05---xisosawi.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/20217042574.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/wesaxunoturaziluwunedujo.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/wixosata.pdfIn PDF document text
    • http://lscapital.it/images/file/powonusebe.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/kupurepugemefav.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613122bf61847---66888291680.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c6fc6be32---xuzumotaxiw.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/45177906688.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210902195011.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/89621210990.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/bogatebuzu.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamovamotuwikitidikexa.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109122104531305.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/8963433595.pdfIn PDF document text
    • http://larustt.com/upload/ckfinder/files/pivipaxu.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/99450788176.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/11577365187.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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 17524 bytes
SHA-256: ac8292a666baf9b45e16c108264777db6d0370421061cfa94f0b400611b4ec51
font_02_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 10364 bytes
SHA-256: 0e7b019e4359239d64358132de1c1e53b7aa9eb2754bebaf33041f1d1e1f069e