Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36a7535686d184a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 06:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d9a2f552a92baed8e84e7bf72cb4e5e SHA-1: 0e7dc41c3deb5d7519aae14c6c8824088803eed6 SHA-256: f36a7535686d184abe05664de8c8691d35d54557ff59d5267d7d9b8f631a0985
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to lead users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://indagosrl.it/userfiles/files/sufefibi.pdf In PDF document text
    • http://dcbestwings.com/uploads/files/96885684104.pdfIn PDF document text
    • http://anpo.vn/upload/files/jibijiwidowusovot.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109041126324945.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/99599773308.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/34441850465.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/xadedixubekowegupisa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131433655e5d---18398672198.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/jozirizazomadi.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/94084339646.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/vuvelen.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/suxejekokijomapubaj.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/32329333908.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/lijon.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/93666368586.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/voniborikigutamupifibusu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16138d74460d08---jipititijororeboxegexabux.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/36856482578.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/jigutifupafelegot.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0f43543d6a746d9b40441c6deeaf68cd/tuvexuzikesorovozebewined.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/pikorurejuf.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/935648755.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/nulid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=us+topo+maps+androidPDF 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_off0000d70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 10380 bytes
SHA-256: 68bf15810fd757cbcaa3ae87154ad210135561c9f94d207b14cfd3dc236d6731
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 17820 bytes
SHA-256: 826321ae6a23d0b189e6d79beb038db50a2bab1173f214f5436efc7512378173