Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cae79032fda77f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 07:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 117fb0993b4b16c62d3ec12c9006fa7d SHA-1: 29796b5f66361cabe471d661dd937e90f7bfd332 SHA-256: e9cae79032fda77f1644494692eeb66e7df5ff4a0f6cee83ba2caba33318ab46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to disposable hosting and compromised CMS upload directories, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=gmail+creator+apk PDF link annotation
    • http://zuche0551.com/upload/file/besumanugowafesezi.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/rogoxaraxozab.pdfIn PDF document text
    • http://househouse.it/userfiles/files/gisobajugumurona.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/metumeroza.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/56746992422.pdfIn PDF document text
    • http://4bx.pl/public/file/40891079024.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/51972301052.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311472ceb85---48698917692.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/48337675452.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/puwemefifanenizuwifejof.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/61781002348.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/28635086332.pdfIn PDF document text
    • http://xfswchem.com/upload/files/76178687135.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/dedugimekafedefomaxatokip.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lojadekepamewevisi.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ve0fp169var4do1b72aq0qobs0/dilodipemoganoluwokotuku.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/biwelumubini.pdfIn PDF document text
    • https://swiz.eu/files/editor/36499850667.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/17514679409.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a16803868---57471237525.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/26645237576.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/vivobenu.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_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 19040 bytes
SHA-256: 7e6987e35e2c6442cb716c6557f827c2b8c349947312a5b6838a50cbbc9a5279
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 10396 bytes
SHA-256: 7e4ddb9e44b19de776ebb359ce65e06c04193e984d7ec4b4890c7b1cc2d4befa
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1