Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6fbe6b988ef8b3…

MALICIOUS

PDF

84.4 KB Created: 2021-10-09 03:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3c8cbdaee8d4279773e2aa7aca1db33b SHA-1: 099f8c98e105c22218b224d9a7647767d35f55b6 SHA-256: ee6fbe6b988ef8b3fd3f0ba2087cf846aed13975247c59181707b93c8a452cf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to disguise phishing or malware distribution efforts. No scripts were extracted, but the overall structure points to a phishing or credential harvesting attack.

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 https://krisoc.ru/uplcv?utm_term=dave+chappelle+playa+haters PDF link annotation
    • http://agro-pasz.pl/ckfinder/userfiles/files/rexozu.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/sabajinamu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe806a8ea6---55511120629.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/suzajeturipedilo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419917e4aac---4519824995.pdfIn PDF document text
    • http://pinxedien.net/upload/files/fuvetetozusuna.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/27518697561502af7bed73.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906010955.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/62790253193.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/fijilikuwilanumazogopij.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150abdf5ca99---7849686982.pdfIn PDF document text
    • https://activepymes.com/pub/file/51476416709.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/43073686546.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/vovawonilawojujozumemezep.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/55189561112.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/91370084074.pdfIn PDF document text
    • http://findacommodity.com/upload/file/15811100036.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/bonagezus.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/98429835405.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/lojidagetubivegolotu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/talope.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/banebabusokaminekafo.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/15566567893.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210904_9101A90199E370CB.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091105195895.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210914_09D12CB002B0AAFA.pdfIn PDF document text
    • 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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 10336 bytes
SHA-256: 2e0e6b51c1929f537ed9b47e275210200c01a6ac0f895fff948853e01ff92e3e
font_02_sfnt_off00010f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 19448 bytes
SHA-256: 1d911cab23a153a333ecd9b0f1619f5e7d20a592a89b3b921b8828a74548e791

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