Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bc43a22eb24da5…

MALICIOUS

PDF

79.7 KB Created: 2021-08-24 11:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a239e5cd35fcd2771bb9a5a5e2e14530 SHA-1: 8545eaed6e6f098cb3f3bb6afdc87805dfe58854 SHA-256: 74bc43a22eb24da56c4e677316057e760ca5e367c6da4677a42c69adc84254bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, a common technique for hosting malicious files or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of 'utm_term_redirector=True' and links to disposable hosting further supports a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5197c2b137---mivuxenojetumapi.pdf In PDF document text
    • http://oroszvilag.hu/userfiles/file/64142540637.pdfIn PDF document text
    • https://baptistfriends.org/media/28185188701.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/famomoku.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/28690203844.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0689c817---waxarizoropebivilatazov.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/81688942593.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7524e6b570---gadasunusarefomi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea0273162f---57596846657.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/migemudebisabegewafefib.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/76750534199.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/10307207887.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/mojizefawunusekeweluteti.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/28339305031.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/bubozozonujikeli.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086845ad1f8c---dexujopuxaziwuloz.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210731_F82DD32761B5C125.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7fe37bfe---49959603770.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/pkq8ef97hg30eeonud03ci0kfgg2r69i/tamelosusemogevosipapoxi.pdfIn PDF document text
    • http://aven.su/userfiles/file/megijusozulodufovafise.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/95466633174.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/jinekinog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=1+pint+of+water+is+how+many+cupsPDF 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_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 16924 bytes
SHA-256: cb6ca04185dd9c637ea9535f888b032852b0bd4cf56fa0eac411e68f70ff1a4c
font_01_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 10952 bytes
SHA-256: b8036a554a5bc8101dd003549e38c06016d9b0a2abc9932b9801de9660a44389
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1