Malicious PDF — malware analysis report

Static analysis result for SHA-256 992d423d826d4dca…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 00:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d8b7b198f2b77a5b9773f4c17b26bbb SHA-1: 2c470b8c13c078ed67695261fb52b71081f9578e SHA-256: 992d423d826d4dca54604f9e7860072b19fcea356e7d8ecbfe178e02f852c84b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97febcf3dc---wexozifenofuwodorupi.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc7dd213d---ruxamasedelizelowobenadiw.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210818_9F92144D2AA3FE59.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/vodunewele.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/66352038814.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/nofarij.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/5047059210.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a19a4d5af5---mumiworavep.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/bdf5a06a4e396bd0282659c0e617f72b/99412454388.pdfIn PDF document text
    • https://elitediesel.com.br/ckeditor/ckfinder/userfiles/files/nizezakorusolorenagokaja.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/1j1qqb8urjf5ncti7tm2kfrc51/berilagenududerukagav.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/fuxapidaxatutam.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/demavapudibegojuratoto.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/fufoxatepotoxonojerole.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/kelizixi.pdfIn PDF document text
    • http://medica-brno.com/files/debidivod.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e038f107f3---jidopegilekalu.pdfIn PDF document text
    • http://risme.vn/files/zibavativovekan.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a28c53436---38859940194.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/nonasud.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b41fb7086---todakelulodubotozer.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e94fab41721578578f63169159bd1e15/73614556109.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/50042998362.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/xotegabudaresew.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccaf5eaa06---87991468634.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/18252367128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cortadora+de+cesped+manualPDF 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_off0000dccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCB 10716 bytes
SHA-256: dbc59733d6e1ac02b16b673263a7a8adf7bcc0097c9c502a72d2ccccb3b67f07
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 18968 bytes
SHA-256: 9199f87bedced93b17fc52e01f2967f6ee04e8a5cf3618c1751f583dfad7bfe5
font_02_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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