Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6bfa60a7e05a97…

MALICIOUS

PDF

88.0 KB Created: 2021-07-24 03:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0063e8c3935628907c57ae12afa7a33 SHA-1: 0759d2a46058573767cd631b4a560d24b43f4c22 SHA-256: cb6bfa60a7e05a97a72e4b66c948f76eb95d497049389e9e5db220b565ee11be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised or disposable domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to evade gateway scanning. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to facilitate the download of a malicious payload, potentially via JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wfca-czech.cz/temp/userfiles/files/sigelerijejidetik.pdf In PDF document text
    • https://bnbcostaverde.it/userfiles/file/84251296274.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/4329381704.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/68794679488.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977e92a9473---9426090131.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1cfothb19ptp12k80ifa266s90/32670941234.pdfIn PDF document text
    • https://bataretak.com/img/files/file/tumotapifesakowitojef.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/68005344423.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160780d186b65a---telewetodekijojesavobo.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/xunikojawuwexakofofop.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/zumaxuwegenajisolepi.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429154338815974.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/zufamogisilakix.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/37108494144.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/pesunowuzojogoranenipamug.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vscktnc716jaoo556svbrrehs2/jomago.pdfIn PDF document text
    • http://ubest.ru/images/file/gumedexo.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/81154635146.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094434ead07d---40779831381.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/87286389614.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/sotizewubexu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609266660bb98---29577840007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dell+bios+password+recovery+software+free+downloadPDF 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_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 11020 bytes
SHA-256: 69bd2d91935351f296d9937c69b3a6262753485ad20d6c05270467efed91dbc9
font_01_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 16776 bytes
SHA-256: 60fd25b5f0e18e42cbbb36b31c8d26b44f15a729f62d795e8d5e5f7d2bd1a025
font_02_sfnt_off000139a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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