Malicious PDF — malware analysis report

Static analysis result for SHA-256 af93c220f3263224…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 14:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a31071e42f93ffb01643475f0d83cb86 SHA-1: 3ad76fba456c2cb019e5bcdfe71e49ba88f4e431 SHA-256: af93c220f32632246092291f2a0f2c4c98434303c8fd94bc7b58c6c25e8cfc98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://konferencii.ru/js/ckfinder/userfiles/files/25767599302.pdf In PDF document text
    • https://tradingphrases.net/userfiles/files/vikijusemawenuborix.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210902060809.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/84271627140.pdfIn PDF document text
    • https://salonrewards.ca/images/file/boxabajufuxama.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/nenimabaxabe.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/44915732708.pdfIn PDF document text
    • https://asiapharma.la/files/files/fajozonenivenavejatikunu.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/15524982732.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161399c896f764---39575132789.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/nuwojulubesuvo.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/luvimubinemixo.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/gibogizijegalabokusetiz.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/rerunu.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/vujozujumojuzareroxo.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2499c26a008373c820e17a9b7329cdb7/naxekesupixinimezudin.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/vaveb.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/rabumaxisa.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ma2vgsm261j50j1knbmu4iaq51/49204875286.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/92327801280.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210913085828.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/22324465254.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zakile.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/sujufikolulukixirovisewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=outlander+diana+gabaldon+read+onlinePDF 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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 18096 bytes
SHA-256: a216c56480c1c27f8ba1c0b0773f240ec289516d86f7017a7507b226afb979d8
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 10520 bytes
SHA-256: 5e7db1ce10d369deaa0a9b19210dcecf5e877e3f433e0ba530ef2021444bfcfc

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