Malicious PDF — malware analysis report

Static analysis result for SHA-256 847a2eba59a8886b…

MALICIOUS

PDF

85.4 KB Created: 2021-06-13 13:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cae7cf5a96b16fd5f63d58fdd40f2db1 SHA-1: e9c7dd9533f8c30e3fd0e78326b3a1e090e83655 SHA-256: 847a2eba59a8886b93938421aa6bc4ea3f1052d7c736c3d31e566f7ccea822be
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to lead users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/uplcv?utm_term=vlc+boucle+entre+les+points+a+et+b PDF link annotation
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d55ddc6fbfd6e387ff7323ac11f46507/63061678953.pdfIn PDF document text
    • http://midel.me/userfiles/file/25027777829.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/26154626182.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7813441faf57763b71f5735aa81796be/53009992597.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/989df4d9b67bd7deac2bfe15b8793251/86259902495.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc957a1dc---pimemut.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a5ad08fdf22be24e9594be46f14eb7cf/fodexi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6gkff4bd2co7a7rb220cqh7mf7/68479315655.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8ov92ofj3udr1k4clujho20qls/36106968828.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d5vgjqh616h2b4d5vlsonogm1j/nagoribudobevedadavo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af6ff1e2c1e---delenuruvu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/rq4io9e8j6tuajj5t741p13fdr/46674200874.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d2669865912da3a97660045adaca06e5/vunowagoxuwumiruj.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/89ae2e97de78e98bde421e1f9d076ee1/jodosomosamufuf.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/82075970725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn 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_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 4916 bytes
SHA-256: 687f1cc8777da1e844bb57eac1de2603f01993859a42e6c3dd7d3cf0cf5a8c61
font_01_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 2240 bytes
SHA-256: a94fc0b04a3ff4da30cea24b3fb8f2fee2c1ab2008078f8bc2ee051ee710afb4
font_02_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 12832 bytes
SHA-256: 2cccd6e9165be78e05e56e90c5faf37dbefcadf9ee1abeeaf1c718c3d59c0aa5
font_03_sfnt_off00012438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12438 16336 bytes
SHA-256: cb8b0c3b75634a3ac40028f3142d2b99dbff9c8bfe93654f62892c2eba89f065
font_04_sfnt_off000139bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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