Malicious PDF — malware analysis report

Static analysis result for SHA-256 7996215481ce4148…

MALICIOUS

PDF

91.0 KB Created: 2021-09-19 04:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6a70d086691cc2306e59520d515f661f SHA-1: 007f7494b3095af41b72186dc8a34e5121417e5b SHA-256: 7996215481ce4148b3cd5c4674cb9551126f986679e55b1269b9ca5eaece4387
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=free+tamil+movies PDF link annotation
    • https://listocrm.com/userfiles/files/zifitofeziwogesetu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/33da335966809270df743cd0a3e77264/4512979843.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/kulalovubiwamaxirarirak.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7d21eba9---resurujegevevawasod.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/futore.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/6212873882.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/wusakenujezatoma.pdfIn PDF document text
    • https://davaocarrental.com/images/file/nolar.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/fevawojujigek.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/konoxew.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/62932973385.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/visitekegitoj.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/67596182899.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/rasumate.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/dofijuwubikepikuvo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16132953d6e1e6---jegumosinuzebivumexabunem.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210907215754.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/79247326030.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/zikotigofajawazawofuji.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/sodejuwijewuruvivod.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/36075068647.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/29255502118.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_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 10208 bytes
SHA-256: 635f005c07306174ac03d262ed672306041636d6736174362d46027d3c4b3d4c
font_01_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001323f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323F 17228 bytes
SHA-256: b6b6d558956ab9420944f8afaf19024dfd8b92291d68b79fe1324d7233f04b1a