Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5c21831765a619…

MALICIOUS

PDF

81.7 KB Created: 2021-07-30 17:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 703dceb458af680b8cfb5f2e5d1d3f2b SHA-1: b2c0d46fe009d43601eede85670212e3e14cd2ab SHA-256: ae5c21831765a619ae9072272c26a9def752c97c09d1b5c1a29e7d1fd09b47aa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://ratco-hardware.com/Ups/files/99132021611.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7ad93e71---puzilejapujakubumuxip.pdfIn PDF document text
    • http://artepcb.com/upload/files/43668693690.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/96247136962.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce8d2f5fc---getiwobepatefipisuvir.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210616075415.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/pujamifufalujiso.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/tasidukubamazamedajosuxak.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/kubufokadetexux.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/4197749062.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d1d1a8794---81192627211.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bt184nctt08pm4bgo976440fqd/nowusovazom.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ed1d1f9cd75a829bd7365bfa927b6a7/kijevuxudufofariruzupafub.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e1432ed4e4ca7887dd8dc87bc89766f2/45912231724.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5c3cb6531---nixadudasozukinasob.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24774368572.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baaef6ad3fb---75070214343.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094caa463c3c---zojifamulatujuw.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/sawedugudujesiveguzesi.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/33485782479.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/xamavavirimemuxovit.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609550c5b4382---sabimafuxibifebaz.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/42b8a0ac54f283dab5ea368469e4bc38/40001385165.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def7e9ec8ca---nadab.pdfIn PDF document text
    • https://alutat.com/data/file/18142951919.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/wedoxexog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+reset+kidde+key+boxPDF 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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 16452 bytes
SHA-256: af22e4775c9576255d94a1e55c57a49d27d7556131a8e098e53d47d00ac477a1
font_02_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 10452 bytes
SHA-256: dad88af20910c7d48577ca3ac0d0f1a2db2ccea8ee1535faa48c037049aa9eab