Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e93e975f2da745…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 07:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4067e26bd0a4bf5a6a44f06d615acc45 SHA-1: 0f404f70fe61e346ea5e04945e2854e1a0e38c01 SHA-256: 92e93e975f2da7450e6929e5106eda09dd1070fb5367b6f5e77c5a80c1e50e1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm. Several heuristics, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', suggest this is used for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://inncredel.com/uploads/65720468986.pdf In PDF document text
    • http://ninda.vn/userfiles/files/38736710687.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/lotul.pdfIn PDF document text
    • http://dzbnf.com/upload/file///sidogix.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/8020775066.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/bawepepazisanugope.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c850543b156---48574327779.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///lerokapigajimopavugor.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/37578191887.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffebd322a1---fepujarerirebewib.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/33299902489.pdfIn PDF document text
    • http://bluebossa.pl/files/file/65215851093.pdfIn PDF document text
    • http://prograsifkalip.com/files/806359623.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/47839700826.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/8148173804.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/86719201938.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0goobri1qhqmprlghbccttpvbb/7448069772.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/45925661520.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/kevuradojujanaxapele.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/94404185314.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160889ec853a91---47931246899.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/mekejuzoduzesilole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vinayaka+ashtottara+shatanamavali+telugu+pdfPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/90711346866.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAF 21876 bytes
SHA-256: a7c4b25b7194fcf6073585d6b7dbfad52d8c5e3eb8c7e12d811cf7f1f16a2033
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 16316 bytes
SHA-256: cecac62ddf9842e24e5aa295a7437217c35a03ea3258f310dcaaa5844d6ce37e
font_03_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 11288 bytes
SHA-256: bd7555364ca4459a780e7bd4150434b0dcd7bbaf6ba1a3a320b07fad30e3d4cd