Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e5b89e91673d35…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 12:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 269449647cbe6a9d34b8345899e750a5 SHA-1: 12428e552f9bb5bddcd0fc5f81d49fe79cd2f5f7 SHA-256: 97e5b89e91673d3579b4b45b705fbcc53f93ed251fed32ef6263ebb5e2d8f50d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cuathepvangohaiduong.com/images/ckeditor/files/timutamibixobafemokori.pdf In PDF document text
    • http://hanstime.com/userData/board/file/48603264531.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/vuduvolivuf.pdfIn PDF document text
    • https://network-italia.com/file/gaxizug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad57015e---xaruv.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/68827335479.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/21970673283.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327dc03d261---jowebaxutafadexamazurine.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/54051476708.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/kisidimagixilaw.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/23779804764.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/79113201667.pdfIn PDF document text
    • http://getem.pl/files/file/mavugex.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/vajujebigawe.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/86429795203.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/3552803095.pdfIn PDF document text
    • https://steammining.com/userfiles/file/78226615407.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/vofajekegakazaru.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/warogobog.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/15932618936.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/runazesedipizofi.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/21994349258.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613759f3b060a---gigosipapenajizuweloripu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=marvel+mix+smash+apkPDF 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_off0000be79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 19960 bytes
SHA-256: b47a295f817eb0cd17182a475f9230c717ab6390da96d63536e5644941592c1c
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10448 bytes
SHA-256: ac512ba7d9775182f7dd91d11a2034fb3fc6bb9382b92ebcc25132e0214d27b2
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1