Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ff3466de9ce169…

MALICIOUS

PDF

71.0 KB Created: 2021-09-10 07:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3604f8170cb405098a5d3fa51752fcb9 SHA-1: 6c95b996b440b65f8441211fd329a377ed660597 SHA-256: e0ff3466de9ce16984f0a9d0f5ef940bc870cfad03ad0404d7ea89fc812e7c56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. Embedded JavaScript streams are also present, suggesting potential for further malicious actions like downloading additional payloads or executing exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hoteldanang.vn/uploads/images/files/fizemu.pdf In PDF document text
    • http://gradn.ru/uploades/fckeditorfile/35975240726.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/56677051333.pdfIn PDF document text
    • http://01host.ru/userfiles/files/zikovulatonalixonidekij.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399e2321a63---bukusegotome.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16130be663594b---68010946985.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/kalakupatavosi.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/84274309079.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/71669523295.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210905_164400.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/55711457808.pdfIn PDF document text
    • http://bienbao.net/uploads/files/94590894833.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/4813976940.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368e62efa97---niditez.pdfIn PDF document text
    • http://artepcb.com/upload/files/wuzowom.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/juxeviromesajopowetojevi.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/tijesob.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/jadak.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wafozoba.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/39613137099.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/35617709909.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/sizefamugowubovodi.pdfIn PDF document text
    • https://laser123.com/geektic/files/2413107677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+cs+1.6+console+commandsPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/dakotidakipinovirin.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_off0000b7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FE 15128 bytes
SHA-256: 5fb110a07de0a98fd3936eec96d0cecd974bc3a1b58a5d38983568faa7e880ed
font_01_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10680 bytes
SHA-256: 76e1e9e0eee732326677005557f39e14991c124602d319cabb94db9ecb5fa41a

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