Malicious PDF — malware analysis report

Static analysis result for SHA-256 424d31117d63e0d4…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 10:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f8e5ff132d0df80906bd4626a7436f8 SHA-1: cab913058c0a79c8abae8655bbdc8781f8c9d186 SHA-256: 424d31117d63e0d492910e3ef0776a24cd4c1028b071ac76d3f5b64423f8f992
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=playing+android+games+on+chromebook PDF link annotation
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9f7dcc98c427c4970d187707606ce8d9/32077468506.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/55423204712.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vol77q644dnsktfos9lamegim1/52273579078.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/83048446937.pdfIn PDF document text
    • http://aurora-c.jp/files/files/93782354975.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/xujewuna.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cicjnsdr95hnamg20lbp2rn0ho/deduzolaka.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/95152978941.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/pixibevuxinuze.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/29205156243.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vigupubupoperaputimutekat.pdfIn PDF document text
    • http://builderall.info/userfiles/file/kavebujobupesok.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/wuxunujirelomonivaminatug.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/kenabojimawirusati.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/kivowarawifux.pdfIn PDF document text
    • https://turbooto.vn/upload/files/92720438972.pdfIn PDF document text
    • http://word.mn/uploads/assets/rimovada.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/bojulegilasibatidapadobok.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/67274494646.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5b0a1f4dbd562f719038cefde5052707/9589055665.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/26290772833.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425da79e363---44588054252.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/zixodidezozalibumojinate.pdfIn PDF document text
    • https://fond.ru/userfiles/file/vozokenesesevoneg.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/kobumusaki.pdfIn PDF document text
    • http://52963566.com/upload/file/202109060124310467.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 11064 bytes
SHA-256: 4fd61e18aa6783d95c62092104ca2a9768e0690a0062fcd16bf3084ff14ea06d
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 17484 bytes
SHA-256: 12da7d099dd0635cd73dcb8f51e5609f610f5c7726db72461ce03cf0a51ebdd1

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