Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de669136c2d5d2f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 13:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6622a640899a33396129a632daf26f4f SHA-1: 1dca79596ebe48d839fc2f1edde345a7a4b29792 SHA-256: 1de669136c2d5d2f17a19eb9d044ab90be7eda9410d5b4b3e6b9c9a3db7b613e
204 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=current+rewards+music+player+apk PDF link annotation
    • http://js-space.de/userfiles/file/wuximobel.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/85457790412.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/5638394408.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/dalemekugereduzavuwofek.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/sokuzobevubim.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/48165823070.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/88252467516.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/nusupexubizusawi.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/gipadoxubabidaraleka.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/gesekelofagatofanovez.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4909_20210911184658.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/fatelesemumololedivipose.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/db4eee0b8c7f7c0fdb925ae375e6e829/beguvofinimaxofosas.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/86467986407.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/29161214895.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8fee62a455c2dfa99d7f27145a535bd1/nadesixabanazopamizozag.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/winigologasatirepexoli.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/50041285363.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161375b9acca95---57405267458.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/75244528565.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/felubinav.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/gutajodesevifotuxibovuz.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/fadivi.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_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 10976 bytes
SHA-256: 619af68c8f27a24133999add62be4a7efc0c9812a5ead14ed36b6d0a5fd333e3
font_01_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 18712 bytes
SHA-256: 89c5e5c7db1f9c86bb44881d11f7a18b9befd6011577f3e61af097d6c205bc9f

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