Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b46c1949609c86b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 09:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b203ce6d57ba2d34aa212250874cbc4 SHA-1: 186bf7790c92fa20d582101ce4de0a9e5087243c SHA-256: 7b46c1949609c86b9718caa17c784415634deff870680b7382a895a6268675c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://hanlacsclub.com/ckupload/files/zeserunazinovib.pdf In PDF document text
    • https://sankaibearing.com/userfiles/files/ruxajorupa.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/91904661264.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab0ed593f---36361453576.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/sedodemokijexeberupipel.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/dowar.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf77e78cb9---81028629994.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/fa664c5595fd183fb63c22fd8616112d/xatizewenuxiwokasos.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c9bfcce1f74fcca68e05801d1c794bb0/jusutepidexov.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/51745626920.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/32493407890.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/fadorezifijawel.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/eunriton4bbtrclqftgsele7gc/44623676014.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/navakatowedumeseb.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/pajenugenetorekok.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7f5sh7llrgkl19v0b1svp1ii4e/divafabifif.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/51551873193.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980411dd1b2---sizujavubevi.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/47394504379.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210609123246.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/luziva.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/88261109296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=to+be+trustworthyPDF 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://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_off0000c4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BE 10204 bytes
SHA-256: dedcef99686b4cb92198f2d4a4472273955a79581e89f0a1b7243859dd81787f
font_01_sfnt_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 16936 bytes
SHA-256: eea23d47f3b5a8b5ac654c51755f121c0c5d817bef1ac4158a269dc0275559b4
font_02_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1