Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc214f3ff3b0efd…

MALICIOUS

PDF

91.7 KB Created: 2021-08-03 11:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 800b5476126d18535456b42efac56187 SHA-1: 4a01fc10abdf79d91c653e4e2a74bb919574cf76 SHA-256: 9dc214f3ff3b0efda4674e179c551084b744402120a41452c896e0a7bbcd5945
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://beijingxinzhi.com/userfiles/file/20210508233119_1236598084.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c857e7513a0---wonuse.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vibokoxegu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084422c92bf2---51796310823.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609de711d6ca7---nanam.pdfIn PDF document text
    • https://orrizon.ru/images/file/59300077144.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///wisogilojudovafuwi.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021072118520973499.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1669puujk9ktt42sjjae3l6o8u/nezowiluso.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/msu8fnq3a1rj6vsb6ddmq7np6b/3386704503.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ab69497b1---49403473277.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/662f10cf3c134b3ae5a1a1fed39b089e/litezigibavunibalisojuz.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/93306338829.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3dafed858a36e9329ced99bfbe7b99cb/15666651624.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/pulojajawok.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e212a8f4af74dd6bce3f52718fe7cfc5/61927725202.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/4989042718.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd81611687---tegixifux.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d450d2538cf64533336438b90cfdae70/ninebomigotiniso.pdfIn PDF document text
    • https://amblamy.ee/upload/file/zifudajix.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/54850990887.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/82777741407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=free+download+tekken+blood+vengeance+full+movie+sub+indoPDF 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_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 17672 bytes
SHA-256: c6a87c11791c6e011bf50dcedb689d21e5060ff84362155f5ae3cf4928826f50
font_01_sfnt_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 11280 bytes
SHA-256: 6001995925f258a0081fcddbf855e56cc0182a3d5bca7041c389c2ec4977c8e6
font_02_sfnt_off00013b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B25 3152 bytes
SHA-256: 9660abde623cc5da6a466eab8f361587d7985672b7e5a871b6caad225b7be663
font_03_sfnt_off00014812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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