Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a1d0d079a05e06…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 11:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 580392cecf103d4dc75baea215e374eb SHA-1: db54a7f1140c14e2cb0fd8281f4db06a27d4ddfe SHA-256: 38a1d0d079a05e06df968326f52476fc9b8e8a202109dd28f8c926e53c509b9e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms links to compromised CMS uploads. This suggests the document's primary purpose is to act as a lure, directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://medvor.ru/uplcv?utm_term=free+online+conversion+from+pdf+to+jpg PDF link annotation
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/tmm5cok9q5co75ks3cgdr6ml1c/dirozo.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/99c367ed47f260e05d223f382aa04ee6/dopogewemudave.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/posokivideve.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6aa3d4a35ddd9d52f0b8b178cd0b1674/22043847535.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/m5vuae4u5t2kmeje6ipevruemu/sakenuluguwipi.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/99fbec6e94563b7f3f22913edbb4eda8/83043960406.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0ddd719667e9bac4b9d088a159f05288/96194332404.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160876e685d999---siginazuwa.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/degebuvujomaj.pdfIn PDF document text
    • http://clingac.com/d/files/6525689635.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a88930fc---76730586260.pdfIn PDF document text
    • http://scriptonica.ru/files/files/3191342329.pdfIn PDF document text
    • http://euro-ex.com/somigobajijejitemarip.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/80583713957.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/fagabagokebavakiwinoja.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16096760a71d14---78742656324.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34858b62---37777597838.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/soxelumo.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/lavalafefatebasomejalifit.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lonegujurovate.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/30578944265.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/funekaxiwapesoregeleluz.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/monatiwunewuxeb.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/61239818928.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/68871002883.pdfIn PDF document text
    • https://ezgif.com/webp-to-jpg?url=https://example.com/source-imagIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 10972 bytes
SHA-256: 44da8528bcd10497bc691043d02aff62abced0950657b88211353c523588450b
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 16616 bytes
SHA-256: 4a29f70cc5135b61372f9b1ba72b1ba20744c704a9af3bd1aa1c35c686d5099b
font_03_sfnt_off0001357f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357F 16076 bytes
SHA-256: a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed

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