Malicious PDF — malware analysis report

Static analysis result for SHA-256 49df6cbb5ea95123…

MALICIOUS

PDF

88.3 KB Created: 2021-08-09 04:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4e7c1e0bc8897b2e3ca6c85a9ad530ce SHA-1: 96ea2c6bb3320f64c07eae3b3d3e0e4d589c8200 SHA-256: 49df6cbb5ea9512330c46ea2db3eee35a4facbbd61773635d7b0c5da78370d62
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to potentially malicious content, likely for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=2011+honda+accord+sedan+owners+manual+pdf PDF link annotation
    • https://mmoxx.mn/userfiles/files/21829699345.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/32620881898.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/betulututatud.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/r6bfjd63g3rbgvl7qkq43502t4/21906430801.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/kubovezipetumosutefa.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/20310577933.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e018b9c6105---tubazub.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5c19338c469665b963b3384a75cbd433/mubanatigufiso.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/88842888797.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2ea2a2b9---77680203654.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/safapawimujiw.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/pasuzigilodepi.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/reros.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/putufezetixukobimubekanut.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc9d6f1ba7d91d7d54a933caef68db66/fipitewijixitoxexim.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045963981cf---8393773355.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b4fd57226ecc4866f5cb648a17e2ee69/43880095220.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/dbc743a3793585851f43bdadfbc38acf/gevoxefekuxedogepede.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/51127029079.pdfIn PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/79454308707.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ba0bf3a12ee9b501250c490a9d16743f/tujisipuxex.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/jasuwovepajunenakeko.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608a961987a65---naxomurizazabuxutori.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4132c424feb13782ab47e1feedc515b0/xubokotalozipuku.pdfIn PDF document text
    • http://nscenter.cn/upload/files/98382549069.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 16808 bytes
SHA-256: fef621df179577d36c9f73b59f08f0768f795a170291c7692d7d79012a6e7bb9
font_01_sfnt_off00012176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 11080 bytes
SHA-256: 3a41949b9d0b0f443c9697f2a66349b97f493253e48a9f6a09ecda3ef805b94a
font_02_sfnt_off00013b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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