Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1faa5a22111a0e4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 16:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2e3a5ca8221f3fac84033e0e34e78165 SHA-1: 3ce3aa027b807860e3cde3593dc9c2f89c8128ee SHA-256: a1faa5a22111a0e47fc7e35b19c3988a743b248123aeb052ed6f1a5f084ded0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sbs-group.co/userfiles/files/tapewezegafajagozoj.pdf In PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2eea4456---wuzovakiwi.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/begun.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/53377444859.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/kakerirujuleso.pdfIn PDF document text
    • https://mmszke.hu/files/file/mumovufojapowi.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/zulufotazukoxo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2o1f5vuancg0hj87hg0bqr0i2u/21368316777.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a73122c5---38797099860.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/99099726241.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/mezuledojumali.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/2900664129.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/beroti.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa56ebba5---bikaf.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/1181640476.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080748454b24---wisilagip.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/72228646776.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/53440116200.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5de381ff5---goberigako.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d2a7fb7a843c29f1fdb951e8ccb0a753/83304091681.pdfIn PDF document text
    • https://projetovm.com/uploads/files/98244653519.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0c231366a430d0f5580e8a94c634fb9d/fafujetutasekobowetojob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=jbl+t110bt+wireless+in-ear+headphones+manualPDF 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_off0000c14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14A 16492 bytes
SHA-256: 71fc79aa4cc5570f7843f17014c0d5b40ae1ff7fa5bff6ca08fe6655ff1cf62c
font_01_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 11184 bytes
SHA-256: cdd558e857316573e722626d9c4fcdfd135cb8723886ece545844a5be039bc0c
font_02_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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