Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f42f527bae42426…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 06:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a2ba69eeb33da95b93467dddcaa5b3a SHA-1: 3ac6136d1966232bc4a903badde6afdc764b9bbd SHA-256: 7f42f527bae4242620b000c42c9ab5a6d01e39dd99a1330aa922a12569cdc586
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, including compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://pibar.tw/uploads/files/202109121354246908.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f7f0c9708e9aa852d275ae4b97dd9bba/senivosurenujulokizi.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/tukitufuwuzebop.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/52901821290.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xixifobop.pdfIn PDF document text
    • http://lblussana.it/images/file/7638963057.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/99950131617.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912060334793464.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pujixuvagekefapupefuke.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/biwopikenivasotosa.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/38152887248.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/pifefelerusuromefaluka.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/dukutula.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/68300989623.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/romiribi.pdfIn PDF document text
    • http://school15-tyumen.ru/f/58296088233.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb7e8de89d---zaxodovupuzimunizepuv.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/39318822504.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/70504484910.pdfIn PDF document text
    • https://www.znackakvality.info/files/bunoziwazuja.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/33890595220.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/71653584870.pdfIn PDF document text
    • https://inarsindbari.org/uploads/pafawetiwezewigikube.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n9fcr7knssclpdk02slv88ju41/32399258015.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/xogazokoxuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=harvest+moon+androidPDF 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_off0000b757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 10420 bytes
SHA-256: 1f3d7e58c99eec625da759ca8ba0f174def531b07c37ac271a2b4caba49a8857
font_01_sfnt_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 17248 bytes
SHA-256: ea01ac113b228825ae9c5ef8a912aa56cb1695ed021033b3a8c5736dd82d62fd
font_02_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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