Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58e8bbb453df7b5…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 20:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a17dfe36057e74d04b14fac6777d11d8 SHA-1: 36d7839cabb7a3e231f54e950870ad39ec4c31b3 SHA-256: c58e8bbb453df7b5dbe7c377ac9a4b545b85da89479609d9d74dacce0d0c69b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The file's structure and the presence of external URIs suggest it is intended to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://laborke.ru/uplcv?utm_term=convert+pdf+to+cdr+format+free PDF link annotation
    • http://augustaelectricalwork.com/editorData/file/vimude.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb0c92560---63234129947.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/zijenorutilex.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6lbjjj5s76e1ckmlip45ciqfo2/vakerelut.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/382738941e3601d28045849d5daf27d3/79290617597.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5b863e5e7391431eebbb2d00971a9494/soxobonojitoruzujolati.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/35472145277.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/wexemazoje.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/wanuwigamavelebeniwe.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/22720644979.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836803b5366---busipedutovi.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/62737659714.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/rurowomujivevudifi.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/fewalusekugesek.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/vizesezilulerugolaluzati.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/93251936498.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160735fa56ef38---52931952623.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da4ed3bf03---wolaloditu.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/61280172874.pdfIn PDF document text
    • http://qwerty.pl/_data/file/xumenotakupo.pdfIn PDF document text
    • https://tl-systems.hu/files/files/saxotosikasitozatur.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_off0000ca4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4F 10572 bytes
SHA-256: 73f39d5d597c0ffa6f3eb2487bab1771d49cd87639a7a600cd89711766f6c3f1
font_01_sfnt_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 17936 bytes
SHA-256: b390120df4e7e2dad565bd31a90396ba1428546aac6bc6e20722ab94beb59adb

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