Malicious PDF — malware analysis report

Static analysis result for SHA-256 2021770584fa1d3e…

MALICIOUS

PDF

92.0 KB Created: 2021-07-30 03:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0a56c98b78f3391769509ccbdf796e59 SHA-1: c73c43a0d200a40e9e54762cd372ddba87572d5a SHA-256: 2021770584fa1d3ebf9af275aed8ed57b18eee3c7f1ed1786f0596a99b35931d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised websites and potentially disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=how+to+generate+a+standard+curve+in+excel PDF link annotation
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b33c90223c58a0cce12fbcfea05c5ff6/betamexujabirilud.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/48166568174.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/98965852098.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/46476609365.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c5f8833943ee8e530db234a8d623da30/nanuwabekena.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b15ed18d---75580585463.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b295ed42539---mixufi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754a8e3a74d---zanerabizuwaliwapufezu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842bb206644---72627739937.pdfIn PDF document text
    • http://www.bash.cl/media/file/duremud.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/12822816681.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609affd20ea4c---nesorusoguvugerusufipubi.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/rujezoxikunubogeloke.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/rakibevepopajujawuw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160790c3db7e66---35957269090.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb36f947e3---93677270393.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe7f81b89---sozijuvikoduj.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c575032f5a1bdf6b626962d6f322f628/basevigefezuwumuvuni.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/4c0001b4cb89f5c67fba46a6cd8f78f0/lofirojevobirixo.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/norakegux.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/2a477702da847d2fdd52d0a8d128456f/18881930418.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00188aa47d---jubotawovijusadutalebijad.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/fsv31f5kdiv9raee7nqi7i5ct2/21065561756.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/85331548884.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/14366161222.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607babb9b8bc8---mapikupututovozax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 18084 bytes
SHA-256: 6a7825a2174519bfd945867484fa3d4872129567dd15118788813e3fe02d1b57
font_01_sfnt_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14828 10888 bytes
SHA-256: 67584b5f346a8263300220881b97b54133a1e933c55237cfc4308a35315dcd5d

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