Malicious PDF — malware analysis report

Static analysis result for SHA-256 378e06f12cd3e997…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 11:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78362f4500681c8b0b24ba4029c38f5c SHA-1: 4b7e4c56f50ffa3990d78bb4490a613c0689dca5 SHA-256: 378e06f12cd3e997ab1c54584e23068668fb5e7faafcf3db02559db08f849104
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coherence.cz/userfiles/file/57017980948.pdf In PDF document text
    • http://nousgarage.com/userfiles/file/vubixogejofupir.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/49929761933.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2d37f3560b41c2c59652d0932f6bcfd7/79783222025.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abc76f6b2---87357944837.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/majapazeda.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/25643101825.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f146c263fc---7823546109.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///44797036812.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b8a1f85ca3f6ca32ed928d2c14ae3434/66897258358.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/29581296340.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/205b595c75n0lv1a3deod4fr6h/56799289093.pdfIn PDF document text
    • https://kultmotor.hu/images/files/zezave.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/12427096809.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614594d575475---60928749060.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/2324983444.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fonobujuvo.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/kowofofixazipim.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/zoxuxubipadofupetefejib.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/otez.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da9a3b8fd---46269022522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=farbauti+god+of+warPDF 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_off0000bcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF2 10384 bytes
SHA-256: 50492c7d5504f0009fc7e97bfbd617c9d72d840f3ad5e23fb9edd723d5304d36
font_01_sfnt_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 16816 bytes
SHA-256: fd3a8d6eaf364a6f03d254741685deeedb4691f073e5acf6391c88225b740b92
font_02_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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