Malicious PDF — malware analysis report

Static analysis result for SHA-256 8249f9bed844bcfa…

MALICIOUS

PDF

92.9 KB Created: 2021-08-10 09:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 832901aa161d2024ba4e37f8160241f7 SHA-1: 21a305dd3281fb2a9222ccd20216c8b12573a04d SHA-256: 8249f9bed844bcfa08adc197e4fda569042681f3e0d36280cbd80c73d44cd2c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of embedded URLs further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1d20a1aaa6dcd852bfa47357e50f87c5/33453967610.pdf In PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/99326866465.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081393e63d31---nanosowu.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/46807379090.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/54834964110.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nalerurekafegozasitapug.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c206b7317d---30083064044.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a99c7149---18374538326.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/92838674754.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/mudoxodidodisava.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/78305105609.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/78780978744.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/tidabazowed.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rkn1ievqc0kfqj5hlif18liho9/35998458948.pdfIn PDF document text
    • https://digireg.cz/upload/walofasipasubiliti.pdfIn PDF document text
    • https://profesa.net/userFilesfile/newalokonodawibemoginef.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b3a43dac8---fedufulitawiviwa.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/98966303703.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/fimonovofunufepimifamivos.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/42881820812.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n8n4kvdb99c8rviof86c0djds2/kimenovexewojesebuzeje.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/7ef59ecb6d62a8d24a90214d0681df3d/danenenuzuvomigufumepigas.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cc398ee8a---gurataduzopavodujowemen.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59901600878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=excerpt+from+a+room+of+one%27s+own+chapter+3+commonlit+answersPDF 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://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_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 11120 bytes
SHA-256: 3a4ed67b566fd94bc1f7a4b112bd96738a22d2cc9e66ae1d8bf26f53704c3791
font_01_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 17548 bytes
SHA-256: 8b2f6848149443d862affd9ef48fd9f33e2b066b0426ff8d9cabf8d662d88f3f