Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f7fe2dfb5c1994…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 02:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06d926f389c51f5e05203bba3f941ad4 SHA-1: 221c627880a91c08ed4ee888ffe0d7f25dc912ee SHA-256: 98f7fe2dfb5c1994198d5a412b236982e23e70bab4ec1f19e21e27f2b1abadc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=friends+the+one+that+could+have+been+full+episode PDF link annotation
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf8e3e5e7---jomewabaxev.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/xapakirapenol.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/25534420131.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613019d2314ff---wifatigusolularivu.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/maponolukogeme.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/92316316394.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/18058084682.pdfIn PDF document text
    • http://vititanon.com/user_img/files/61366668519.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a54a7fc5---wikirujepixobixadoxone.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/38834282361.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/kutebunime.pdfIn PDF document text
    • http://ledins.lv/cms/file/87447950431.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/36183474373.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/65216089857.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/96985675490.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/73881569799.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/45767613177.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b935e2d257fa0977f66a7a87a4481595/95942209182.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/kidaxofibarixemuvesuj.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/20485848854.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/47574847542.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/jabodarubegejen.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161385e0566c72---90230575682.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132819717246---6647267267.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/mipumojonewas.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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 16004 bytes
SHA-256: a9c09e0a9a6aa4f2047234d4969d642e0eb6fcb62937dee900c3f0f68ec12b20
font_01_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 11000 bytes
SHA-256: a15ceb68b362d1c7a6af9db0253dd0e9be67cc8ca64e6c1189d18415eabf18a4
font_02_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1