Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5496f56f7dfd66…

MALICIOUS

PDF

297.1 KB Created: 2021-06-29 02:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d73fc7a022f1ba349a0ac43d3e2d80d5 SHA-1: 0f7ee00530611f9469a1a1be8b873d59c605edf4 SHA-256: ad5496f56f7dfd6669e1652c9d3420a1e1b7f2b9dd58504b1d0068f1c76567b1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of external URIs and a link farm pointing to compromised WordPress uploads suggests a phishing lure. The heuristic 'SE_INVOICE_LURE' further supports the interpretation of a fake invoice or payment scam designed to trick the user into clicking the provided malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9559

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=trails+of+cold+steel+trophy+guide PDF link annotation
    • http://files.ibiza-ferien.de/file/rutonepotadofipe.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/80504075639.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d61264d8385---60664228732.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/24513142650.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/debegosalipebive.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2d8698b3d23e8019648f02009a6b2ad1/6453094658.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096880335ba0---5167905976.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/29453127035.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/2120551389.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/11999614193.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/mqi1vqlf5er0idsul842nicapd/82430307781.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042915334373499.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/33870671691.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609883f86018d---64455322532.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021514167538598.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/674bf590d55afd4fc1a02a475dd2e358/sesizutezoxetupoma.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/r240g640gvnmvlvg4d88ov54ts/38539198320.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/kufufasolamidejuk.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/fbb59ca7408763d81f530b8b036cbdce/lizijeta.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/21938833728.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/34274473026.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0e2406e86fd1284d7598c833f230ab3/49396187716.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/84742015430.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kexogenuworifu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003a718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A718 10972 bytes
SHA-256: 0ea17c0a22b2feb73415de255fc384f0ca4285433a120716c2b7550fcc0d2641
font_01_sfnt_off0003c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C082 18008 bytes
SHA-256: 176e78aee63e26584e9199e795168ed3201a1c535717e458ee96febe12eaedb4
font_02_sfnt_off0003dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DCF3 29756 bytes
SHA-256: 5506ceb6347ae8c4be427fa05bbf7384407033b8053bc55357cd074771fbd425
font_03_sfnt_off00043151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43151 30712 bytes
SHA-256: ef90d76eba3db1cb5dce4220747b6f405e0ae4ccc5170485ecda51cb8c26fe8d
font_04_sfnt_off00047d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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