Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ddb95d8a896a5d1…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 00:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1413a4b62e0c3d17cb10cc9aac2d204 SHA-1: 46ddfebf11b830a8bcdbed725723d7fe3a6f90dd SHA-256: 6ddb95d8a896a5d1895dbad693db97e4a51a34e26f88830e240a67ff76b234c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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=g+sync+not+showing+up+in+control+panel PDF link annotation
    • http://pogservice.ru/userfiles/file/rozimexasekepafij.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/gavulepusosaxizuwalige.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8m6pe6k3m401tcrq5kk8612931/61930742013.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210815030012_812162912.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e5194327b---minidebomozakemo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/pugukisulutoxab.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/jobuzitaxap.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0132f194f9d6c809deb38791f37a7872/zurip.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/74399158145.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/56313500305.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/vofuzipilafufemozene.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/siladonobez.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/36468967583.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/bonojaradoke.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/dolabaximezuvosudima.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fd7e1c4f---64477618723.pdfIn PDF document text
    • https://tckontrola.hr/files/16832826570.pdfIn PDF document text
    • http://fructusartis.com/i/File/vusatilaposi.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/divivemejegiwad.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u826pj5ggss6ooaeemagqthi36/gupawagus.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/54946807437.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/098b5e734a1940ec2f3d0892ce2cc63e/desutunaresomofeturazila.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/32938642407.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/77276720943.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22689cae1---72358375674.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_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 10992 bytes
SHA-256: 4098c6e36c725b90a8ac4a28c04c05c26dbd95fa26bf519b79c99a358e15c80e
font_01_sfnt_off00010f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 18084 bytes
SHA-256: 0f2ed034ec47fe5e2212c5830a380261e80992ca760aed3d093fdf62e2d47677
font_02_sfnt_off00013e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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