Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b2a438ed856bc1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 09:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1be6d0ba21f2a816ff29aef96c1f00d SHA-1: 491408214394135301ee4ae89a627c9fae94c4ad SHA-256: e3b2a438ed856bc1aee59a2d5cdfea30afe069bed7f4f1e6ab65a8892310e923
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to a malicious site or download a further payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=brain+test+game+apk PDF link annotation
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/dazifidedosepagapafuropek.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/20141130524.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/linelejomiwofaxova.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78dea4589---kudisenekumeda.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/38756204251.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614140214af4a---banoka.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/17259760509.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/gazozufe.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/fujakajozaduzadavajused.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/bajavugepofurozubulilob.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/pizadekarigimodatifom.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161390d9746c05---sigimosedejag.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/62107439678.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/gosereniguwotejogesexowuk.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/pejifukodedikuzolo.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/26760637914.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/65285525400.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355ba97976f---bajugomorunozifi.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/34715110414.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/gefefinabi.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/xewimudofum.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416169babac---68300698556.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141615c164bc---18540728952.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/lagowi.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_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 19964 bytes
SHA-256: 377cd7e394eada869531d6793e6d3eb75f37e74b5b142f3b839982cefc61cb4f
font_01_sfnt_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 10576 bytes
SHA-256: 895f44c46180852f32fe388618d141b3d0232f0b75eb42d98207529beddb652e

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