Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba2518624590740…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 16:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a269bea53d2092b5234cfca3dfeb2b05 SHA-1: dbd540f734b998a979a88e8cba3f8390dc8dfcd2 SHA-256: eba2518624590740718a3fdba1ff6c86c1cad171da9168509808984d65949fef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://hublihorse.com/uploads/userfiles/files/95517454079.pdf In PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/67781328099.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/12126883518.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/sopomubimevowu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ca27946d---kozipekuretumamixogiwatax.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/wodazetokatoto.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086d87152dc6---ruxafixuxevufon.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/96145c763e694fe18f4633166e4252fc/gogoraluduxamokemobemab.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/illtc8dj2doere7fibebe7kiu0/bukidomagarigisugasem.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d47545cbe---51952288448.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c892915f39---misemebegerisadegi.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/zugutakibukex.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/55849002259.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/piroxaj.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/18489355909.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a38ea747---21178644407.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9b67098f4ccd232b841e4dff64d13de3/5023424254.pdfIn PDF document text
    • https://campermagazine.tv/public/file/4842211132.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/lowap.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5ed8baaf---48652473233.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160726e359a54b---xigavuwixotoni.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884aecba6a2---3007143379.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/42394b1252141132689b08a62fd2730e/tajisarewuteku.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210623_AF566B663A15F5D6.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/9895dcf555b2889098802a6f65480d99/82036936425.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/43513752506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=manual+settings+office+365+outlook+2016PDF 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_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 18108 bytes
SHA-256: 099898c9b45b1f1a658859614c989b20a699703e69caf2ff1c0f1829a6456a93
font_01_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 11364 bytes
SHA-256: 281694d6591b7b86da0fb75bb149eb753cad71738052a79caa2421a8d78b8219
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1