Malicious PDF — malware analysis report

Static analysis result for SHA-256 699736c7a19e985b…

MALICIOUS

PDF

154.6 KB Created: 2021-07-01 15:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5efd73845adc45efa41fe7b67feb930c SHA-1: f16f137401752a23a13d1822966f4a45c0c64ef9 SHA-256: 699736c7a19e985b2264ca91f5245c74a84a1d6e37d9f31a7e81919c5935aed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 https://medvor.ru/uplcv?utm_term=clean+hands+pure+heart+song PDF link annotation
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/h9roio4s0jolnugl5ulviaj9d7/78122654423.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d19431b3c---kadute.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ddcc7aba---24349914800.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/ferexijomezimasusoxotuwu.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/wojup.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d59c9524487---dokufevoluk.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/oschd4qukk4gt7p1cdvkurmcls/mutodelagofavasin.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f1e4f3822b972daf7063a3b9b0f7f86d/fomanosu.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/fezukosarotisopo.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/lisobipup.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/598a1d6dd118990e66a4614e97edd5f6/7561132412.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9f103dad---59240954784.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/velitikefomufopepesami.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/9bir6hr6c1bn0f7adngqnf3bms/semikaguxozodogunifuvez.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b77040805---juxizomaw.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160721625e6fdc---26449335133.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaef0a48040---24258119085.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/71143395106.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f87ec8f84---fixawopavubuvorozadonezi.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/78386847351.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e6307250---9286728141.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D33C 19504 bytes
SHA-256: 33b416963edbf69bd57bddb1f8408b6ba6c64f7e27e3c677d11d05049c333dca
font_01_sfnt_off0001f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4B5 22780 bytes
SHA-256: 4840d15046e06a6740f03d0f899f933a45e676da2f8e1da4270275fe4e561c8d
font_02_sfnt_off00022c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000244b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244B1 10712 bytes
SHA-256: 7f5e3fcb2ec6b242b56b281330be667b3d109fa59e9f6701a9df1ad733ec86e1

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