Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e3af1d556a9f4f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 07:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e37fef082df2c51195dba12bbdd41dd6 SHA-1: f6ce1db3bab7952c24bedf8383272f3b26185888 SHA-256: a9e3af1d556a9f4fc40ab02892a544fd53e0b4336e2fb8e4f9edcd7273251f03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f435592cffa7986ab35a8afda867178b/xidafejibir.pdf In PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/31425245582.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/gejusifunaredalapemojubaw.pdfIn PDF document text
    • https://kar360.com/resimler/files/18491837315.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/rexikututolewifowe.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a198cdd39e5---5219485495.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/wawixunigokifiloguwuga.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/lixudusuvalutojizafefujuv.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/74170155640.pdfIn PDF document text
    • http://akademibt.com/resimler/files/6244293740.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9e44d7c674e8b23a53069ae94be28f89/bemapogijirewera.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/59198131470.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/07361e67dc777b52081baaef7eee37c4/79017396044.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/bb69d427f51921691c263bd7462331c2/mojiguso.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/jorarel.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/nirebi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a018cc21374---55397547100.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/petuwivasejizekasebulu.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/22798834730.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/142970a2117838fde685f5154c0f39bb/67029806698.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/luzoropogapijipud.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/13307410807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=winter+mulled+winePDF 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_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 18900 bytes
SHA-256: 8bd7c799866e6150e7da895fa2f1f46bcd6ea1ff6df9feb87d405577664b3446
font_01_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 10136 bytes
SHA-256: 723a3ae8d3048ceb8a68bd1db24de6af29213f4e019183fe6b85ec714949c27f
font_02_sfnt_off00012cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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