Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbdd015e3805364…

MALICIOUS

PDF

90.6 KB Created: 2021-09-22 19:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b397a533ce3852dffbae7744f51712fc SHA-1: 4e91889afc0b5ea5c8f8e6b27a7b1123aa7ddcec SHA-256: 8fbdd015e380536427d8c3b9c382f29ac5e6709072be82869859faff6dc5d1fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://neboskreb-irk.ru/uploads/userfiles/files/firogituwipuzex.pdf In PDF document text
    • http://gruppocreta.com/userfiles/files/sivibaw.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/zosozelerakaja.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1fc583cf---66886084790.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/sogipona.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/vezejuzivoluli.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf32167e2---38828658830.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/57345831674.pdfIn PDF document text
    • http://elitvorota.ru/f/file/puresazevezufaloda.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/murun.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/97373332020.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/wogagaloziref.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/19054787895.pdfIn PDF document text
    • https://bfull.ru/uploads/files/xuvozatulemabokan.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/lalowexixoxasim.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/nifid.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/50868961647.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/dupasigizox.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/15271131963.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/milaxusitukeriku.pdfIn PDF document text
    • http://mweb.cz/images/file/nipazifezewov.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137ae8f5b1f0---39923723577.pdfIn PDF document text
    • http://videlec.be/ressource/file/25607114289.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/45938155445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=scrapy+screen+mirroringPDF 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_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 10760 bytes
SHA-256: 714944f0593b9e4e3538e793f525b296c4c57467815b6762b26d7636733baaaa
font_01_sfnt_off000111a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 19408 bytes
SHA-256: 07890db4bd6e5daee99f15f83beff84e81f1635a7a777d2154b816ec198f189b