Malicious PDF — malware analysis report

Static analysis result for SHA-256 d947804e3af05d9e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 17:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c07e016cccd0e35d6177b9ea5859843 SHA-1: 09cf0e0b198b09d491d20728c2b0c6491f1af2ec SHA-256: d947804e3af05d9e558a0987184c95bf2da2e46d534f95c6f254cc49334bc37f
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 disposable or compromised domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://4998horo.gmmwireless.com/contents/files/88804636099.pdf In PDF document text
    • http://styropapex.pl/userfiles/file/zexepisoworenov.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/sotinenofixuvu.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/wolezimidupusobegagere.pdfIn PDF document text
    • http://favourtec.com/attachment/file/xovibose.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9ac6b4de---78035855953.pdfIn PDF document text
    • http://climtech.com/files/files/kuwokisude.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/89077788139.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/labulotixobakukut.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/24311255341.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/gukufa.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/suketewapivagak.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/41964775976.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/41533397857.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/40375466468.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2eb6e24e0---vakenesiwimedusuwinofetep.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/xobirofetasikunonotori.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149212f2e8fc---10797907086.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/71976780687.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/44624165335.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/58633226651.pdfIn PDF document text
    • http://www.chablis-gautherin.com/ckfinder/userfiles/files/15262275423.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/keraxonikagodixuralesif.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210906130705_2140775848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fox+papercraft+templatePDF 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_off0000b279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB279 15952 bytes
SHA-256: db381e23c2f8829e13f297d5fb7b4008ab484cfd9cf5dfcae95422d816ea23c2
font_01_sfnt_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 10356 bytes
SHA-256: 30feda4190df14b0d39113f1731194a533743f0753db2420fb2a5297354fa365
font_02_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1