Malicious PDF — malware analysis report

Static analysis result for SHA-256 0028bcdd6968b782…

MALICIOUS

PDF

78.4 KB Created: 2021-08-30 00:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50f983b805bf1c95e61873b84ceab083 SHA-1: 46875e2937ba1af8c1d4c59bd7d22480cc4a33a4 SHA-256: 0028bcdd6968b782e0f7db70b5d0ac5befc15dfa20b8c09d59fdbac507524a8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of numerous links on compromised CMS uploads suggests a link farm designed for SEO poisoning or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab5374e36a---wudigak.pdf In PDF document text
    • http://cartopack.com/Images/file/zubizozurujidorogurom.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ecc76a74---45383683843.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/56356998366.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd48514109---1045023996.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/xopeka.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dc4ad9a90---fizomigizu.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/lifijesinuteludo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5a9e39220---tafibujekadetamapo.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/ravotojebuf.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cc86eca104cd1c194761cf7be1c7e009/xevosejen.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5502b4351---68524297021.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/74116048453.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/bf51fb9391b092f0a50063b18f101fb3/bodap.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/dojosinov.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/62576998408.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2f03ef32563e0107cd251edfbacab9c9/21189245311.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/97732111226.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/396a2a4905c0f8f01a083b247c97d226/nojebotivuf.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/momukobi.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/vuriwafurowafimemefarike.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/73028401074.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/35438874491.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b43676c474---luzes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=all+are+welcome+in+this+place+lyricsPDF 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_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 16752 bytes
SHA-256: 7916d4ad8587d90a88158e261b0e840286eb70b857492cff6c8f741f71f90067
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001120b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120B 10820 bytes
SHA-256: 0e2fc5418147e3db884870173867c34c16c8acfdc4f27d3554c54cf8db33c2d7

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