Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4bafd3b35c1e92…

MALICIOUS

PDF

80.8 KB Created: 2021-08-29 12:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b05f3fbd1c200fffc308aebe9cff39ae SHA-1: 90698667a3aef06faa2eccf4523e4f08c60ca38b SHA-256: ea4bafd3b35c1e92117a395dd49a1b27eb364bd3bf1ff9a81908dc618f7b6ef2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to other PDFs hosted on compromised websites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of encrypting payloads, which are then decrypted using a password provided separately, often to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1978fa77b97561274425e95807c8eb6b/tewoninibawome.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/98cee24675184ce62825bdef454d6cab/34647521022.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/a83bvki8rtd5knf69vnpff3tf8/sosuwowemobivexakoli.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/19587397457.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac48f1cc2c---xinirovuzebotiximaxaw.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/10106942124.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wevoranexidoruwupu.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/tizapumalatedosoni.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/fesetisex.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/78066897963.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/938cc92e847dc4b089724774678602da/mejojusaxegabupumasa.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/480837835762bbf27efb9e644400a78a/40391917783.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/8ppk3jt12v2nahv75iv44s8i71/xiwabigejo.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/wowatitemifuzoxixireka.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e493442626d---kakemavavagumodo.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210710150247.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/121ed5b9294de99e40c65a46d70745b4/51392126743.pdfIn PDF document text
    • http://chenruichem.com/upload/files/6228962379.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vn0naf31rcbjpss18fbf188id5/43645456974.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b854ad4ad92---pepofozirosagofifizalu.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/nosepoke.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/12835963801.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f41d1120---xosutazakone.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/pukepusemuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=god+of+war+psp+android+game+downloadPDF 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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 10868 bytes
SHA-256: 83dec3accdc5e671ba8803ac5cef5bb64d37c94f7d67daddd660195586cd42d9
font_02_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 17552 bytes
SHA-256: 5354542fcbd5b296b890d6173bfa53ec4b6643f860e8359bbd25964b5938e608

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