Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8bbce6b07b3ccc…

MALICIOUS

PDF

104.0 KB Created: 2021-08-01 16:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e462fbd0fa5d7b1661d9e1d5d5e52020 SHA-1: 5c9b044d585b79854da8cdc7b0584da3f227c5ab SHA-256: df8bbce6b07b3ccc74891927d729da2b2c87479344ae5f23e3a7cb16a2e066fd
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely lead to the download of further malicious payloads, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f3c957098e9c0b7e8a7cd51058177a95/jadosejixe.pdf In PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/368838cd977e428207d8c68ea20d2f53/supawijovefoda.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/rujarevewigekovu.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/sebidanawexaxelajudupow.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078404a24cfe---6357483421.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/86309261389.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add55f85811---waserijirepulubaxe.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b39d608519f0097b29089bf019e066c2/watufepilimifis.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/varurunetod.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d69cf2dd03---kubizofojiso.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/bovefujapanumegamimil.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e7eb3f16---75155320034.pdfIn PDF document text
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/juberutab.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/60fd2244c7b27141a8d2b9e5c784ffce/88341221497.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d10826fb1f9d04051861f173ed7b6beb/dorupeladopuvazab.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/29343194807.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5ca6e54ff496fa5a348b40ef29428df8/92580243909.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e291319f1---biredajozanasimuk.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/kibatexenadetib.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/nuvasokeluzetijasoxisedel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+are+the+5+proofs+of+the+existence+of+godPDF 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_off0001330b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330B 17372 bytes
SHA-256: 2fc9dfa2846af87634c18a488f125073ae2a43870804997ce63dfc8fded6e80d
font_01_sfnt_off00016070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16070 11080 bytes
SHA-256: 5a09508724f0a7b059c50c2fa96fdf80039cb60379865944073d1dcaedfdb7a8
font_02_sfnt_off00017a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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