Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dc571e9237023f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 12:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 543bb8be366d03fadc3b5c72d5d28c97 SHA-1: 9112d7e1ab421feb52118bf092c9fbd36be17d65 SHA-256: 90dc571e9237023fca068fb18f8b9849c27f16711d6b0807ea45ec8c3c0150e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to malicious or compromised sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.awakohchang.com/image/upload/File/iwawewevabu.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/beb8e510b6e82edac53ae4e03abc5b1c/59381588143.pdfIn PDF document text
    • http://bulmarconsult.com/files/nopukejeb.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxiladapifupuvikuwa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/28207955840.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/kemafuro.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/mumobakerote.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/perafiw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dc43ad1c57a---54864819832.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/58153664293.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/54524913435.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d2d6f2eed3818ed53738a004b8ce3a80/digixusiwabofavefo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/24b99ef506af18b8d29f5827e9bed251/67091214560.pdfIn PDF document text
    • https://memoservicesrl.it/file/xedazofum.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/48921040045.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2d1177c4d---43665412327.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/tipaxujunibupixemibixo.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/75438636887.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782f4b6b167---sisimasimabaruv.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160787481b840e---47776220614.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f12ba0d62a---nulelurejesapifopog.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/pomefutopidakebogojoxu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-23/20210623100245808074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=blackjack+strategy+chart+6+decks+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_off0000b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 16268 bytes
SHA-256: aa69efb19803b99943a547a9fb2d34cbe195575dbc547a1036aee1c6fddaf075
font_01_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 11140 bytes
SHA-256: 8296533f201b8736ad16ba695fe516b564b44e8a059c2d48a4cc8f603914e97a
font_02_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1