Malicious PDF — malware analysis report

Static analysis result for SHA-256 1178e39b33577931…

MALICIOUS

PDF

82.7 KB Created: 2021-08-16 02:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4138467d4df01cb9a2f069ae7791adab SHA-1: 2b904ef2133a2ca8602384790862d03350b87a92 SHA-256: 1178e39b33577931acab30d2cc7717213cf4eabf163cf9c7ff3e10930012ff26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, with several pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/pq1ignknivasg5bcmaup25lhj0/31933953699.pdf In PDF document text
    • http://happysmilecard.com/uploads/files/vadimegaxawufuvoz.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/penalitop.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc8b7e1a2---61596766877.pdfIn PDF document text
    • https://mahae.hu/files/files/15326110831.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/01d68bf4857614678489fe582ecb3b7b/10980681799.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a80238ef9---gijoxuf.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ea4e55c639f2237472eb3411ff91e2a6/72946496908.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2bpfqihgrql9bqq46sor960363/2492864019.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ae895bdd391de343bdff26211d1ab038/nawelipafan.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/gaborajakunukiwawanogot.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073503227d29---11176808670.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/81933270126.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/20171075514.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/88f3247fa2c192279e91da0b1657f7e9/rofoxuwuxuzutidolokusulow.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/povafefuvumejik.pdfIn PDF document text
    • http://blueyee.com/upload/file/221257416640.pdfIn PDF document text
    • http://vodnik48.ru/content/file/beneziwive.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/monuvawililixexofe.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4997e02dfa---dumokonaxixulononujokovij.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/tapuzema.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160767a2a1189a---70903328591.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608030ad79bea---82368176963.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ee1fb74cb9cf5b171ee949ecc208205f/midepesizezumobagawoj.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ffe17105b6fd9005f8acdcdcc7d26ca2/rupaniroperofuwuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lista+de+verbos+irregulares+en+ingles+para+imprimir+pdfPDF 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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 11104 bytes
SHA-256: b6786ad3eaf5ba35685bdfcf4f670242db8741c0561e01001d6602d5b1b64dde
font_02_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 17080 bytes
SHA-256: 1275ec7399aa2871176cad5f57eac72f6ac341fa41dc3a381270c45560e780cb