Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfbe9605454655c…

MALICIOUS

PDF

90.8 KB Created: 2021-08-29 19:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8df2c99c82d4138defc6f301cd732c8 SHA-1: 1cb51954faa68a33bd3c2d84a60ad033f533d3d3 SHA-256: 4bfbe9605454655c94645b5844582f8d1fb930f140f1d3a38a8a90c22cc3cd4e
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4molvs970p75fuspiqoasuaple/waviriwijovixinunu.pdf In PDF document text
    • http://musorcentrum.hu/files/article/file/begiwakafipudip.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be380fde5b7---97720000406.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/wawawibikexabajojot.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/74891221671.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610fedd9272f1---36541569786.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/91999177138.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/24337283442.pdfIn PDF document text
    • http://vanhacollection.com/images/files/67694358697.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/jenazaxarotadar.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/13890103057.pdfIn PDF document text
    • http://asfalon.com/__files/file/82704144850.pdfIn PDF document text
    • http://brlairport.com/images/file/23351761944.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/68a76dbded79ff00a50ea35c5ec8d840/senuzofibojerizerab.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19edecb6d---92918060883.pdfIn PDF document text
    • http://wdnederland.nl/file/renodulemezipura.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/nuvegutesawajotizat.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/dexadubereponuse.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/8847100527.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/luzitofatojugikepezeg.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/woxalezovujisajuzononu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611706f647721---pizanagewosov.pdfIn PDF document text
    • https://carlojans.com/cms/file/xomojesakeburojofed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=example+of+three+collinear+pointsPDF 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_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 10832 bytes
SHA-256: e8c81e699e45596bee04ef56e8a72eef70604b1cdbb4f2eba7eee01517149570
font_01_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 20052 bytes
SHA-256: 55d7599a9c67b9744514aa6a07ea505d0a08cd7d79d05f6e98ffa4d509022a15