Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fcf4197df838f8…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 19:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06b2972921d0029b51ae4afc6fd20e50 SHA-1: 2d3cbf8e65ba21d21623ed012bd728be0945111c SHA-256: 11fcf4197df838f8cd558c684a1c084cb3886abeb7cd358726965fb25fe78fa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://daechienglishpark.com/ckfinder/userfiles/files/lematop.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370195efc59---wowidijoliwobizosebat.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c563950d---53683896117.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/41022425496.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/roginoda.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/zofeliwi.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/wubulus.pdfIn PDF document text
    • https://tigaintan.com/contents/files/nilaku.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/vavari.pdfIn PDF document text
    • https://e-midas.ro/files/file/boputuxijubojezotose.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/lijenuvifubi.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/xowabuxomafugalojonaril.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/55428456293.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/41975524458.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/20510550543.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/61899931124.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/wuloja.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/lemofewezivoz.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5fc22b183ccc0895dd3fdff10cac6fea/6370487228.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131435793dc8---supuwekoto.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/42901785342.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/xalizazokinogew.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109120710249590.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/15411618825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fitzroy+river+floodPDF 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_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 15876 bytes
SHA-256: 34a2ca9ce692c8de82a110d08e8ae798feb2c84d23d4856c57f0e1ffe7883b20
font_01_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 18028 bytes
SHA-256: cbc91aebb8e71a2fcc72fc24ddaff97c04056d6c0ef5b03595e6630a840acb86
font_02_sfnt_off00013fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1