Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bc312444a43cfc…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 03:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71979c561e3f224103e154716c6aace9 SHA-1: 2ce74b598451df9fd5c3dd612da905142c967632 SHA-256: 02bc312444a43cfc996acff02e12b6ff0a9d3d11b57aa3cd9f63a4e4115f7090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing lure or a downloader. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/relijaj.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1425c0318c674a5f7c2bd3f4fa7aa007/3290263034.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/xakixixu.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pazozusajuxomifuna.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/zefigurumafe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361908e0116---bepupewulixawewiwafov.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/85806045103.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/nejave.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613be51a9da78---26241350156.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/petuzuwuresusu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341982c0013---1762956694.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/zarijunubi.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/mudodezonawukusip.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/mifajojamujimuj.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/vadafupebofer.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/26591785619.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/kizapevi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371dba59eb3---39387075914.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/kedipise.pdfIn PDF document text
    • http://cold.lt/userfiles/file/66947879590.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/66229453522.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/18594939141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=brim+android+1PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB277 10068 bytes
SHA-256: ee7f97459114b3418df40c1e72dae80b51b3705e5e1c7b0d15d4190be717e7eb
font_01_sfnt_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 17940 bytes
SHA-256: 9e8b1ea4a77dfa50f5c744da2e687a2ceada45fea56abe65466285d7cb0e4b5c
font_03_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137

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