Malicious PDF — malware analysis report

Static analysis result for SHA-256 5064c1060292e0fe…

MALICIOUS

PDF

82.4 KB Created: 2021-07-16 20:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f058d5f5d76fb34be36222ef2b0564b SHA-1: 63fea695f08565edef4885fb65d0437c20377940 SHA-256: 5064c1060292e0feb036ed002e6345dca1693f7b9036e5ebe9d16d4fb7bb48fc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm hosted on compromised WordPress sites. The document's content, though heavily obfuscated, suggests a lure for invoices or payments, aligning with common phishing tactics. The embedded URLs point to potentially malicious PDFs, indicating a likely attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d972899b20---kekubujatomeva.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b46148ab---lixagewonatirag.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/487d68ce7fb5b862b3299091798d0f9e/50903022916.pdfIn PDF document text
    • https://ijp2.com/contents//files/94518575742.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075e44448ae8---45243440119.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607222d404cf5---69626850103.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cad96fd783f---jepafebileruxivapabaw.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/59566759253.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/19bcddc11bb72444faf9f53a402feabb/tazapu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b26ce771---680015703.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210515195643.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/telilufeba.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf629cba7---modisexesomupaduma.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/bezufawoxa.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/bi29o2ot9lopbavs6offpfhpc5/17979612831.pdfIn PDF document text
    • http://webbuilders.com/files/file/kaguxinulegimelilege.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/sabukibodokimenawogedor.pdfIn PDF document text
    • http://df-foundry.net/d/files/77180855289.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/dovabenutobufejodewibegen.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/zudazetojina.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073248beee6e---vudexivarusifixivat.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/132d82f976d124330ec3a9a66ce5a281/mawumilodeki.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4676b2c453---39755523507.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cdbf9fa8e---pigexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=amortization+chart+with+extra+paymentsPDF 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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 10936 bytes
SHA-256: 83eb133f84db83effb65bb9df0ea909377eacc9fec79606c2da3b4c2004c9314
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16968 bytes
SHA-256: dfbb0b38212ce1383613d38424b57b549040a99e4c64c557ef23dee525d37a33

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