Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfdcf34c6803b57…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 07:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76275d77d951d57eeb3474f350a4eab6 SHA-1: 77fedaa45ed5808f05a95e92e4babdbd23f65da9 SHA-256: acfdcf34c6803b578db948253c51517cf95daf22aabdcee9c817e8879040ea5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=propane+reacts+with+oxygen PDF link annotation
    • http://pnc21.com/files/fckeditor/file/1657947052614aef7a49279.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/55030394158.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/90230732102.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7bf6dfa78---29080763621.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16142727fe3e9e---40508568180.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/67398198016.pdfIn PDF document text
    • http://hopkim.vn/upload/files/kuretus.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/diratu.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/89597474880.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/75231511206.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/minuzawibisiza.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/redagizuzidovikabopu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161421ae9adcce---15944198405.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/lizulu.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/benitedaz.pdfIn PDF document text
    • http://shamayachts.com/upload/file/tusase.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/75545512907.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9cc122932b9deb4e4e41e040fc2ca49e/suzijikepu.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210902185614.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/61676209320.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/52345760220.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/73426422709.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348f18cb8d9---tubanudafifavilimen.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bdaca2de198bfb38e070bf66fe335839/mifomov.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_off0000b143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 16012 bytes
SHA-256: f110d31f064bfea144f844dcb485bb5fb0ea5f2b1092ae0ee94cbd4eb0d867fc
font_02_sfnt_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 10912 bytes
SHA-256: a4b91e274cd4e3cb4da2ff66dde76cabfb211ee7e24cb49b9499e2c27e14a877

Open this report in the interactive analyzer, or submit your own file for analysis.