Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3914c972afd1e3a…

MALICIOUS

PDF

94.9 KB Created: 2021-08-26 04:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 074379e34af01c5117a46a39b8cf5f4d SHA-1: 3eaea6bc29e4cb5c71d66f4d512367e9526d4546 SHA-256: d3914c972afd1e3a640260fec99adebd9bfab7e5736f4c81c643e879387e901f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The presence of a compromised CMS upload link further supports this, as it indicates the use of potentially vulnerable infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://digitaldaya.com/imagenes/file/nurotivewa.pdf In PDF document text
    • https://reniuved.it/file/25940850562.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/jomanenujefixireturizakuz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98659201266.pdfIn PDF document text
    • https://megashina24.ru/files/files/fezevunarijusoxefu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9d3b84c26cb19ebab231f4e8ace65e7a/neseviwalulibed.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/59366559762.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5811b96a6d7b5c63cc70caf2ac7f4837/vijuwudev.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210630144940.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/150660143.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/58881299242.pdfIn PDF document text
    • https://jetaime-shop.com/files/10389683997.pdfIn PDF document text
    • http://mcutech.net/files/25863336303.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/11494723864.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/69c023f3d6b56798d9ac7a239cd4add9/pobizimukabo.pdfIn PDF document text
    • https://ntc-container.com/upload/files/dakutupoviwoxebixoderuvov.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/matazate.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/jelodojujekijumadamiri.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wanorefer.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/69769003556.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb4453b1f---64770547726.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/21035293418.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb06581211---58584021464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pharmacy+and+drugstorePDF 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_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 17976 bytes
SHA-256: ea9ff67b555ddc5452e810284b5c25e5937bac873e09b532bd9843431a632414
font_02_sfnt_off00015348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15348 10892 bytes
SHA-256: a22e48b68267ecb84f3789f74e1dbff306e35f5ada90b700f30d5dae0a19293b

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