Malicious PDF — malware analysis report

Static analysis result for SHA-256 585fe2d6ffa0c124…

MALICIOUS

PDF

73.4 KB Created: 2021-08-28 02:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b08bcef9e02ec3bfac977eeeaae435b1 SHA-1: ad96cd8c1123b1bbd0113e7a20b34ed60f38bdd1 SHA-256: 585fe2d6ffa0c124930fb5528d5f076ac91966763c8ad5782d268466354af1e7
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://veterinarycarefoundation.org/userfiles/file/jubuj.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d280a683---93989544035.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4d32881cdec72ef765ff8aa17c490bbd/41026425359.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ca1c1364cd2116b304c81fcde39f985e/904947395.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15847b1ed2---batibize.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/46360981103.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d73c958b---xelevawomipajid.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/762199496.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/sepifitusovojoxu.pdfIn PDF document text
    • http://goref.ru/files/file/tedinewupur.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b96036b5a63b5e291dcd63aa0dd9fbf1/xorobuwumuzijazexemi.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/medevijitigofaveledire.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/somapopobijapuzaxelu.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/zunixu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc490a27e---musiribifus.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jiluzuwasakojanuwez.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/e3tv36va02i74voiak8nc3fa2q/sazirizojuxigitimusumok.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a398eeecce06ec2915c3a2235ebbf29f/futowimi.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/10768136461.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/11263818106.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/36312114515.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/wiwasoledazuwijujagajivef.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f038bbd38---gigozovopebelose.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/jd83evo36hcrh8qb1ftf4huid9/bawuzubekoxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=red+broiler+chickenPDF 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_off0000c251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC251 10316 bytes
SHA-256: 0a6b109dee951068df8e569db6b7bb158a80e3b68e7fd5674b8ef6be3234e5d8
font_01_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 14924 bytes
SHA-256: fe2f8d73fbb2b2505b952e5d1ddd071e62dfc53d11c6d63cf40e55886f545d26
font_02_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1