Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fad3844f558fb98…

MALICIOUS

PDF

89.2 KB Created: 2021-07-17 05:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99a16bca7418c483445b7c74756ecc7c SHA-1: eb17faa2983dfabfdf024075e5183a91f346a8a4 SHA-256: 4fad3844f558fb989060805a19b53ea68ae294522780fffa7f0c09547c307868
96 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate maliciousness. The document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://myphambambi.com/webroot/img/files/tegeveferobike.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc80c2d556f---23038375716.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c53a96229f6---fitukomiziluvidisupaluxum.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/fegepirazemisexizo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cbfd3be59---43738727239.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/xolemevopem.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/tosobebelinosip.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cebca9b15f9---52843725141.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/luwezizutopirigimipip.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/kibamudulaluvoru.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/gitadib.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48a13bf12---32416644338.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021626191624477.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/91022622956.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e0f711bcae6e74d07921bbc357a99cbb/suviso.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dad82277c43---50532872854.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1ed20e1c---jigajurofelivuvewe.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/femepabujoduwanupolexug.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082adf817b1c---wetipumajem.pdfIn PDF document text
    • http://ymmicro.com/files/files/91337316874.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/gd4onri6hk06pvtkmb548fh2t5/nadokufume.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/netegu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a03c87a5f0a60c64dbe741f340d7b10b/49471583110.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kuvugiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+life+of+the+mind+pdfPDF 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_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 10296 bytes
SHA-256: 688d5b9b9026da33d6ecf7a7c39bad906bba755f258dc9723a34228edf492847
font_02_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 17160 bytes
SHA-256: 5e634f3a24da8556375e020ba8551dddae1776318d81b7bf203d44a4ae11465a

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