Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e591cd61fe2231a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 01:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad94eb824de28e8b792006c9396ff33a SHA-1: 69f0efb1a34810d6bd7b97f0365903f129a93449 SHA-256: 0e591cd61fe2231a168641ed4626a9ecee7fa75b9b92b159d69c0fd475cd7850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://8cj2aja7-8mxb.com/contents/files/rapegowalegekilomejeru.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fd377f4d---zafiwuzak.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc19a5226f---82877012245.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/19489875521.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/91748720004.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/pixilu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614697d2cfa47---48939583716.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/zunosafimekiver.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/17022968930.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/gupinokugomedavab.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/zutaxo.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/xowukinupodituluwekibiju.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/venesulila.pdfIn PDF document text
    • http://kasargod.net/uploads/file/14657375886.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/11663023404.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/muvekorubekadu.pdfIn PDF document text
    • http://videocycling.info/files/file/92646658544.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/xojixofuzowusaxusejume.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/sipuxuwexo.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/16795684528.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/gezofopedob.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/zujewuti.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/21892401519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=naa+peru+surya+movie+download+in+tamilPDF 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_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 16944 bytes
SHA-256: fe373103e57f23bb2d3b839ab366ef44047d92fc8a39d22feb19ffb0a97da567
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 10896 bytes
SHA-256: 27c001cbda93479158dee76c53bed10e06ba9077a7ab6a435ecb66fbb578902b