Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a8eb33849d2d63…

MALICIOUS

PDF

97.7 KB Created: 2021-07-28 08:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5170610e7fe994bdf934569c90611066 SHA-1: 30b95ed69a2c17f9d65029d7e89fa3f4002699df SHA-256: b2a8eb33849d2d63315ff9c1bba48a007988c310475fc7815dfafbb7b89aa7d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://asustainable.com/global/file/44337303339.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2004f1c272---tuxamatud.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa885303df5---66431276381.pdfIn PDF document text
    • http://attlas.center/userfiles/file/35872218604.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2f1664816ec6dea6028db4678e106e5/26358690745.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/23605668286.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/kiluru.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/b3a5392bce30a6ecc2140fa492ab3e90/ladisaduk.pdfIn PDF document text
    • http://jucal.es/images/file/39708457301.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/xamij.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/51bb661c9e6c6ecea4ed5c776b84a6ba/64634102149.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/ruwukuvizubevekobizuresak.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc8cdce37---foxudegibawinofetupukoz.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/63400264080.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6100426d06d9f.pdfIn PDF document text
    • http://digifast.cz/userfiles/jeturekizizi.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/sazarilotebos.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8eb885bbe---fezudurolidepiw.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd968a4a9---lokewasokixoniwaroki.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/saposu.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/15581760673.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83a3f238e---94539194392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=2000+solved+problems+in+numerical+analysis+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_off00011261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 19096 bytes
SHA-256: a20f19395e9c0ffd9e7eb4d2d36b0a9a2b47d4c88a5ac5b3747e99129b7b80fb
font_01_sfnt_off000144de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DE 11248 bytes
SHA-256: f2c7de231708e297edff0b06b41e031b16af44ce762618307d82e95dd210b136
font_02_sfnt_off00015f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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