Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e6a6e16b94db91…

MALICIOUS

PDF

100.3 KB Created: 2021-06-25 17:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b5fa52944400c59462c4f2387ad893e5 SHA-1: d183a73d242fd0036dfd06ebdf42636c5b307cf2 SHA-256: 83e6a6e16b94db918816f8d49ecd51601ecb0f6a78932cbc1e67c0331f5f7311
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination and potentially engage in phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/do8ch90l1dbtfkehfv9o7hadmt/xowik.pdf In PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/00745ffc52dc622bdcc7e5e882825bff/wexemapepamikosorogapefe.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/rimubelijud.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/18ae39b9863bb19ce3e4c2ff02f981ff/68269558749.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/14924803786.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1328be01c5de0d525e11e059ddf2d511/32184445900.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed3288ad3---52978794004.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/520ca2a47b812acbae14fe5ef3dc0490/72069230296.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30c76ef0a---kukiwosixeriwagag.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/96411695697.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9ea7545f14a895e3cf60d9a07187a263/61541483312.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/538e09e799a7b8fbfb641f37074b5790/sasukadasumusejoj.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wevipenivuzezukopesa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13442307883.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/25c48854a8d4ff980e82f9597c6a8aa0/68214265045.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b266f4a12573538957caf2031a8589e/83527094937.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/5501025111.pdfIn PDF document text
    • http://bronia.org/userfiles/file/fejexokum.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c770fb3ed0---23656763445.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/27202090684.pdfIn PDF document text
    • http://gistys.com/userfiles/file/gibasezivanapikub.pdfIn PDF document text
    • https://yuss.it/file/pawule.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/cc87a35129f70b90a15a2426235c2440/52838608383.pdfIn PDF document text
    • https://sinarwaja.com/account/files/38467850034.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17301900e---48042596414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=after+the+collided+streaming+vfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 2248 bytes
SHA-256: 66561d23f2eb1695a39bb9f88b80d9683298b042bd99b179776941a2f3878adb
font_01_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 10968 bytes
SHA-256: 2f8524c6533d35ed0dd9c0c0e1ef757a9d8a8b82a808df3858a9dd466f3d0602
font_02_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 16576 bytes
SHA-256: df3eedeae3976c41e4b0d0cf4ca3e03e2c0a174ce5548a6b09fbf00093765c32
font_04_sfnt_off00013e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E62 26780 bytes
SHA-256: ffeece64d5d8dadb07914830cf82863311b990d12d404da420351d354471ef4e

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