Malicious PDF — malware analysis report

Static analysis result for SHA-256 88177009e397bcad…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 16:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c191a27949e185468de82498d7722aa SHA-1: 9480de6b59df75f8d8c269cf76e0e504315e4c5b SHA-256: 88177009e397bcad789cf759e0c5c9390fba8f988d77a707731c53736b361eca
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and multiple external links, many of which point to compromised web hosting or disposable domains. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to deceive the user into clicking these links, likely to download a secondary payload or redirect to a phishing site. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=ews+certificate+pdf+assam PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777484c2bb2---fifanuwav.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210805/file/41722010431.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/8218860293.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/guxifiwulegukosejosar.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/kezikebuzozez.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/zologozotoven.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/gamilarimijigejorariji.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/zidadazaso.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/59662649215.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/k1abj15072o95b5oo6r61pukfm/85984839680.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/74937125548.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36a671edc---funategeguvibixudovode.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/56249780330.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/21e743760f4e4e2b383757125e37cba0/digaku.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/keriporov.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/79074398168.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/1984d5565c81f9bf056281f0560f6047/galetemosexo.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202108181326027969.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/murokutalovemiguxipel.pdfIn PDF document text
    • https://ijpdua.com/contents//files/pixexuvo.pdfIn PDF document text
    • https://noventa.cz/media/files/file/28332931049.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/bolaxefelonuzipozubo.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muvalenonotalozor.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/vademonajukexex.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cb6aadd17---mezalisadututumumiwekelir.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 17996 bytes
SHA-256: f0d18b1ffb670be85f1cd1b1524bd81df8116906a0021e441e7fa1ffb5e84f4a
font_01_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 10580 bytes
SHA-256: 5ac87820bdd24dc4e3d8a2d0db10ef3bdb320304f1f3e36495014d6c2915bcd5

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