Malicious PDF — malware analysis report

Static analysis result for SHA-256 6147b2de3f68b2fc…

MALICIOUS

PDF

84.2 KB Created: 2021-08-20 14:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 123201ebf9afe22b1c2eb3804e789259 SHA-1: 35b816a983d94465a8cadc03938b40226441779d SHA-256: 6147b2de3f68b2fcd5c8714d96486778d325bf33cd6ee74ca57c6a59dca826e9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress sites and instructs the user to disable security software, indicating a phishing or social engineering lure. The presence of embedded URLs and the nature of the heuristics suggest it is designed to exploit vulnerabilities or trick the user into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/phjnqr49dnma2cph160cgs5cb6/domemud.pdf In PDF document text
    • http://myblindz.com/fck_user_files/file/77096711909.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/modopubasonorilajadegox.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fefa1729---tilidovugaxa.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n43a27jj03jre7p8o9ekbcdbsr/7669570442.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/71131177844.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/84439957918.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/lufokoboxod.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/wopopu.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/rvkjm13teoa48djq6lthm6341b/87594536328.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/pelegamo.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/42709953545.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a1868732ce58347503a7b8de3c1b3d4a/33605085966.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160964ccaf157b---bitedaxazorawirege.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/zogusisizemo.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/33981779177.pdfIn PDF document text
    • http://mylodge-naoshima.com/vudera.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/fenabixifamaruruluwat.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/kedegakav.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0fbdff5e6a18e05a025feba2f3914e6d/167730198.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/wisorusalanurukep.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f2672f45f---medawulikatinolo.pdfIn PDF document text
    • https://network-italia.com/file/66277269567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+uninstall+crowdstrike+falcon+sensor+on+macPDF 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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 16892 bytes
SHA-256: af68c0d1f23bf1a29617e9a9ca152c8cc5ad0cdcbe0d704d391b432ba281d6eb
font_02_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 10904 bytes
SHA-256: 8040bd24db09a825c0240bad7db2b6c4312ee29417ca8def337f6b57526add7d

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