Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fd5848e6e518a4…

MALICIOUS

PDF

115.0 KB Created: 2021-06-20 10:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3318de31a3152621743b19e7fb486df6 SHA-1: 8f8ea1a1c0110a07c2cfd8e657beb779b9e0f843 SHA-256: e7fd5848e6e518a4e858b1b010f10997a90f9209dd18fc5fe8500b7c38cf69e0
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to numerous compromised WordPress sites, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://brilspa.ro/userfiles/file/%5C/taxitu.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcaca49df---fabotirivonuwu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a70bc22e33e---63798165305.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2dca3432a02cfcc4c1ca596e5654a937/dojulugawenojokatotab.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfbe339cda---63176826832.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3af1b897---10690655976.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c40f2a990---lorejal.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/durusixigoxofopax.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3216ca60c0---jeruxisi.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/49952875461.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/8735566933.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e497cd014---22597432455.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18300cb40---82059574266.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce929277d7---susumiropi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3aa181726f88ac10e32ddf91244f8af7/42644914102.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
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=orcs+d%2526d+5ePDF 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001560e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1560E 17456 bytes
SHA-256: f784beaf4113e8e40e802c9991942b3a20ad486d8917de1a5ec7b178bd59145b
font_00_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 28132 bytes
SHA-256: df66e82865292aaefbb055eae1a2965720d290efaeba289b661d3d8970c774c2
font_01_sfnt_off0001486e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486E 4044 bytes
SHA-256: 4dcc0af4c051716b9801ae9d4d60e4778b89afeef2d68e5a6c16e8b4bdd2cffa
font_03_sfnt_off0001857d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1857D 12624 bytes
SHA-256: 75d19de055f861ad2b1a2d6687210c613b40922d254a976a6b5cb9d7040cb486
font_04_sfnt_off0001ada2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADA2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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