Malicious PDF — malware analysis report

Static analysis result for SHA-256 854044f9e0e3320c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 20:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bfdb948fd93b9acce612e4abe1ecdb0 SHA-1: 3f48d5e417408ad0fa0b463b7df102e7ce1070b4 SHA-256: 854044f9e0e3320c19860d0fc379846eb111e0d924afce04b839e8ecb1333785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://foundryindia.org/userfiles/file/5132877580.pdf In PDF document text
    • http://yjsyrj.com/userfiles/file/bodanatuwizubuwuzolatibuw.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/6949858e30f8d3906631d0e6acf69d89/91648096174.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607327ec73ae0---silomarekilax.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/fokurujetuvuvaxaresuva.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/lepadoxojazigeja.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/72787010996.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/vubepolamuwuxanuz.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a5b60fe778c76c8ecd30c9b0bb0213e5/tonurel.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/wepuwirojiz.pdfIn PDF document text
    • https://securitydm.com/slicice/file/levetojebisuwi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727d5b11b45---7370327568.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b18ae083---fipovimenez.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/50739737790.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/357dfbc4a9a1a958de0a5bea8835bcd3/4385030955.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/kamemadurikunativegu.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e85cdee75---74093549475.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xaxana.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-8/20210708052449461330.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609090f804208---97345804152.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160866e880a026---jawidimelab.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f1789ea138554674f34970d854d24baa/juxubanirigaduw.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e59fd8190c---xopipufufo.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/wixitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+turn+off+chrome+notificationsPDF 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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 17468 bytes
SHA-256: 244dfa92f66302dcd6392e3913b5fba323c2db96fc8258841da730023e00d813
font_01_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 10776 bytes
SHA-256: 863b17b95ad3e21e6b5e6a632af1dafb6de351d996e1e10f5e614fb9f21eb1fc
font_02_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1