Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca94b8c1c8e59919…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 18:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e3d396372507bc3faf6d37162bb0e41 SHA-1: a2683f7cbe4fe728f1e413059e2bf4dee75bf915 SHA-256: ca94b8c1c8e59919cf374f6142527efe68012c3ef1d878d01c7ddedea2024354
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic strongly indicates a phishing attempt related to fake prizes or parcel deliveries. Embedded JavaScript streams are present, suggesting potential malicious scripting capabilities, which aligns with the MITRE technique T1059.007. The presence of external URIs, including one pointing to a compromised CMS upload, further supports the phishing and potential payload delivery vector (T1566.001).

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4tn7ua7ekoql5a0qe7caefc5f5/49866802024.pdf
    • http://fashioneducation.ru/userfiles/file/mijuxexowademirober.pdf
    • http://sanchariglobal.com/userfiles/file/24701360206.pdf
    • http://ajarnveerapong.com/UserFiles/file/pegevarinujaleg.pdf
    • https://ruiguoex.com/upfile/files/2021/09/05/80894095511.pdf
    • https://cornerstonelaw.eu/userfiles/file/webarozewafobivesuvazim.pdf
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/rifeviba.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613392d05be44---miwuwarafezigolififizos.pdf
    • http://to-kajihan.net/js/upload/files/74303153526.pdf
    • http://engineersclasses4competition.com/files/others/10459303663.pdf
    • https://vilus.cz/userfiles/file/68641496588.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/71139849836.pdf
    • http://janaturismointegrato.com/uploads/file/30239804518.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210909050400.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161300bcecdc94---ronekudi.pdf
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/63299244268.pdf
    • https://bem-sa.com/img/file/72695479423.pdf
    • https://onutglen.com/caningest/images/file/3435759310.pdf
    • http://uniroll.pl/user_images/file/39406133706.pdf
    • https://tiemhoahaibara.com/data/dulieu/files/javizozamijof.pdf
    • http://mlead.net/images/e/file/noxapolomag.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c6qrcjecfi7ktfh312sgkmlc4o/73054792462.pdf
    • https://liftsystems.ro/LiftFiles/file/lowule.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd688c69a---47427223249.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wheres+my+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea23.bin
376e88ec8b0e6833220c02c4593068cb05fb703b273758a5e7d463baf7638740
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 17620 bytes
font_01_sfnt_off0001184d.bin
ffe23573503ade1346f0876d3899bd04e3317ff8fcef18fe150dc64582ae9c44
pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 10620 bytes
font_02_sfnt_off00013066.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13066 16792 bytes