Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48f1e4e2edc610a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 09:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a11ecf277094895f03283383f4da022 SHA-1: 9927d8a30a5048c58a1065d7099180ff3c9a50eb SHA-256: a48f1e4e2edc610ad33f06cf41c2a9263d95ff0a72804ea598a66056aa2f11bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm and contains numerous URLs pointing to potentially compromised websites. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. Although no scripts were directly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=subway+surfers+2+game+download PDF link annotation
    • https://jerseyshorepirates.com/userfiles/files/nilosikapesasaduje.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/tiwagawaturifabojeribefar.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/85497364453.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/xeraniguluralowax.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/55074258463.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/84551879386.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210907155222.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f090bd7bf---62237419414.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b5b2ee84---defadiniwupuxopetobokog.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134a57306341---volawebuzek.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/85998667766.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7ae909db---jumawugutanazereda.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/52927605168.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/68750436432.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c3fcdad5585f47abd6c7ea68a9af8f17/90443499094.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/3928178157.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/22163859172.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/70427283775.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/rinumenimare.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vakewakewofavonawo.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/69227632106.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143edbe41c9b---8044356828.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145a1b91d1d5---19422484749.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_off0000c616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC616 11140 bytes
SHA-256: fe5a272690ab286738cc63563461ec56e5dd8b70af0a5b61f472794a212da73f
font_01_sfnt_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 17972 bytes
SHA-256: 96d8bd084f8c5ef1d6957a2db1e4b07b8799777a3779d712d5c41a53053c79a1

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