Malicious PDF — malware analysis report

Static analysis result for SHA-256 977150d3bf093887…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 06:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99c90d1009ff6d3d31cd1caa3000bdf1 SHA-1: 37a7a1bbb91dc6621a65017dbec75e098696de71 SHA-256: 977150d3bf093887df49e355edc89140f244cd6ea16afba0c9d97389a8419b43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to potentially compromised or disposable hosting domains, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://fatamorgana.fr/uploads/assets/file/sezarotiso.pdf In PDF document text
    • https://asthasupermarket.com/userfiles/file/dopiwetus.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/pepaxizegag.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/nutafegofa.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/21560772283.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/zejiwitume.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ece7c245---weboxilobasexazelixovemud.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/surek.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/55260555268.pdfIn PDF document text
    • http://ipceurope.be/assets/file/55978866109.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5eb6e2de1a298e7c2d02f3f732fa8234/polukevup.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/favepumabi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8bcb0d48208bd43424894998120d610a/22096856049.pdfIn PDF document text
    • http://origo.ws/userfiles/file/58174479635.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210918_72E4B17C77B17940.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/sazulomufunofeguperagun.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8af5dc75---gavilufixefivus.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/42727105486.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/fesebekowagijonewoxij.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/kogorekijisubagewogiras.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/xonefinenax.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/lijalevawipikafidejukizaz.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912090910.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/28762077987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=harga+hp+android+murah+500+ribuanPDF 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_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 16540 bytes
SHA-256: 8638985734dd6c133fd88de426cd712ffa1481a255635128ac7c9aabff2a8a34
font_01_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 10880 bytes
SHA-256: c2d2db11d37f1a0391948c3358a6c5d05082cc765377bbc4d708a6043fd7d666
font_02_sfnt_off00013717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1