Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0aae03804b7695…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 05:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67bc2c10ab5a4eec3bce9eca29202f33 SHA-1: 55003fe8cd74b764dc50bbdc8844eaac6056a82a SHA-256: 5a0aae03804b76957123c43adaa8eb59145961dafd8f1e70fe69f0bcaf211c06
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, indicating an attempt to lure the user into a malicious site. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to mimic an invoice or payment request, further supporting a phishing or malware delivery scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eea2a5798dbf42ab63d8bf0ef5259c44/92596310137.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ba9jkrt65dvrc4toslnl1f2jh4/33985012385.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g1cj1tcoqlu90jadh5t4jvbp02/96391056745.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2339ed5dbb---nekapapemow.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/6141175010.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/70422513928.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/bajemibalevowilin.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/68604055239.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/10320837595.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/64421443700.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/33141055917.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d65d9a0e2dc74aa2faa5f7128728d272/88704724018.pdfIn PDF document text
    • http://staropolski.net/Upload/file/8618204854.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6c1d8052eab050b99afd000dd828f574/82248505786.pdfIn PDF document text
    • https://anfauglir.com/images/file/lemojokasobimixowarez.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/3410563934.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/dunofaxisekataxuxa.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c552de92---dexewilidez.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/gelozor.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/72574695753.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087379f0193c---94275338030.pdfIn PDF document text
    • http://soles2walk.cz/data/file/zogufemojomim.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/rikovexinikera.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8d4900f4d2ebdd97178ba49083cb4568/zekafunijuzinanoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=parcelforce+claim+form+pdfPDF 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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 18128 bytes
SHA-256: 9d779a2d879dc087d8892cf72d9aa4f7aa187e5d0dfd269fba319dde0536b00e
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 10412 bytes
SHA-256: 04194c15fae67f02c954ddb56c589cad2d0c03eb4c28a21db577e2c527720ba4