Malicious PDF — malware analysis report

Static analysis result for SHA-256 024b3da1f16e1383…

MALICIOUS

PDF

139.2 KB Created: 2021-06-25 02:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 28cfe554e42500bbb3024756a0fcfa8b SHA-1: 7e3ecee1374c301550ac5437f593acbdfc23f57b SHA-256: 024b3da1f16e13832d002050b103521abd9bada83e1f5462efcd78c262a9d0c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=ecs+pm800+m2+manual PDF link annotation
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/14362081788.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/20ag8bnb09blmajvtd1a2fi5t5/rijafezepemusisosa.pdfIn PDF document text
    • http://sciattella.net/images/file/66481141365.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6dip2g22g5l15b978piq17l6t1/26702766678.pdfIn PDF document text
    • https://zzhqhi.com/d/files/ruxezosurenabuxax.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/fa6a525cfdf592fe4a829cf4a4280be9/nifebabuziwujos.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/90834310639.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/ripuka.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1195a56318---94712087911.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/28859551009.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/zexajojifilivizi.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac107e6c9---tiziwumofil.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e83006f0---koxupigiputemesodupi.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/nawatatadezawa.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/35739757070.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a5d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A5D5 12408 bytes
SHA-256: a771fbbac4cdd1ec1f774885d0faaa6918db57eed213b0ccf797366daf0c8ea2
font_00_sfnt_off00018424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18424 4960 bytes
SHA-256: 79622060dc0e7784d8d73dffb14d6fcae2131e79f7feb39ac78f16d250ea67c8
font_01_sfnt_off00019543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19543 4936 bytes
SHA-256: d1b32dca059af6e7090159f88f39fcf8b7ba3ec8113ea914e4a2e2f4bf194eb8
font_03_sfnt_off0001c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8C9 16080 bytes
SHA-256: b0e834f6f570921c7f1a2b04a0f0266e205b0b8cf13daf6ef648e566c5fdd7e2
font_04_sfnt_off0001fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBAC 16076 bytes
SHA-256: 1621a87b6bc266bc0e3d5871723ec36fa76dd6d2c9fb76f212020cc469043148
font_05_sfnt_off0002105a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2105A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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