Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f12b1642555edf…

MALICIOUS

PDF

69.8 KB Created: 2021-09-01 08:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f09299ec450963ac87bf1a79f71ffe0 SHA-1: ede413ae51839b2b91bf167722799dc460964ed7 SHA-256: b4f12b1642555edfcb7cf1ccfd26e0de59e9d21817c7d18ddc2628033319b76b
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, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it's part of a phishing campaign or a distribution point for further malware. The presence of external URIs and link farms on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=stage+4+gastric+adenocarcinoma PDF link annotation
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75ac0c2b71---44054469008.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6c404636c280f86209c55b18b89b146d/kobabavifajamo.pdfIn PDF document text
    • https://loctra.net/userfiles/file/wutekupoponepinuditulef.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d7dec401fd94b42d7eae566593a16d8c/7124265342.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04acceb396---bupiwidededipefasolaji.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/60397880116.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/75833052812.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/21752464582.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/781928dfbb0c37d086e418749ebd80ed/30166061584.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/74815078247.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/in4ucr38h5epas7j4c1us3stpk/23410286973.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/74c78f5ad003c0006ffc8ba63c66165c/namej.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/dopuxaxepufivilatudusi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f0c5ce23---xunefowetuj.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/wutetaxariwanedevavoziv.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/65410699319.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ce8bdfde---sikagik.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/94bf9880d802468968fa53eb2bcab13c/nepon.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/31582351654.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/kivabimekuvak.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/47385077542.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/31908076775.pdfIn PDF document text
    • 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_off0000b4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C9 10820 bytes
SHA-256: 0d35e01aadd79dd802f93be7a3e3f92ab3f24ceccd4a28f8b96be904489ed62c
font_01_sfnt_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 14632 bytes
SHA-256: c7f0d29723805fcfa7982c598a682b5380c14080e4d66585ecadc04f362dd5c9

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