Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e3e93a50f37488…

MALICIOUS

PDF

87.8 KB Created: 2021-07-25 16:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a75f17a5c08787f3737fb2bbe000142a SHA-1: 9230fe5949de751122eea5f51829bc76122cbd4a SHA-256: 54e3e93a50f37488c7bf6dd0f425068a83816fd4c5aa34e0cf97c9ff0ba30c41
164 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic suggests a phishing or scam pretext, and the ML classifier and ClamAV detection strongly indicate malicious intent. The sample's primary function appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://airflow-skateboards.com/userfiles/files/fobumawekipudowinedid.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea611efe9f---sujobelatowufejedaz.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/gagafedebajugoxutosez.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d1a18e3b820713cd7e64d7e99ec356f5/nazamofen.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/44339955133.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/26879175097.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/15b555dcec75249209e335524b46f094/lorinedopiditogifofodaf.pdfIn PDF document text
    • https://atl-50.com/files/file/70528319159.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/28235300324.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/mapanirowuxisejope.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/kubezazuvivunatutega.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160799cdf0d689---sujanuporuwix.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/aeda81d7e3359f5ce14a317294ce10f0/mijugadelut.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/go3vvj5v76jghuq5qlo9tnjok8/waxotelezugaripuxu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8108001678.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/79412889894.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/beruwuxuluj.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b850f32674f---pufofe.pdfIn PDF document text
    • https://priscar.com/documents/files/januten.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/pawulerejikatoxoto.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a338585d755---46372346746.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zipopobunegituniduzilodu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b97edd29c30c190c0f021acee2a5754c/59719670581.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/78186596965.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210701005727_m67r22.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fake+receipt+generatorPDF 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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 17136 bytes
SHA-256: 39c7b834a2ddcd5175e8393c91af9bf66ac8157d4e7a089bc39a921d5087b27d
font_01_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 10404 bytes
SHA-256: d7da53e7a63591e0fb3bf7e22e762a62c90f172cedeed2fff93150c19d9a4c22
font_02_sfnt_off00013881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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