Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f516bca5f19742…

MALICIOUS

PDF

91.6 KB Created: 2021-07-01 17:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d925e113748e7cca76705d2d6decddb SHA-1: 5d3767a019e044cceb6693a9108ef2285ca51d6f SHA-256: c7f516bca5f1974268cbfcbc5a40f58aee49a5b2027a0296dd629f2d36788467
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://catamma.ru/uplcv?utm_term=silver+threepenny+bits+in+christmas+pudding PDF link annotation
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d63df2ea68c---derexibume.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/zetekewajale.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/xixosedaw.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/murexoworonorufonup.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/2769701034.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/ditadafivuvoniguwima.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd315aa1f0---kukajimodidazebadi.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/budototepafogakekiwi.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/pekalagijak.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/93968812743.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ccf051d6---wujubokitizufawi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/icod4bbnmujko8i5sejl53nh40/5569417071.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/timapovojituluwuzuzibop.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/14447235988.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/97875962288.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jobine.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/018e7ef63e0be487bb18a30f74fb70c2/rafep.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e462843284---sepajepu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/13fd8e09723daf589670645c212b516d/sipugomunalijovuxoduzaf.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-14/20210514075523784764.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/taxuxupa.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/kibebegazuwa.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/rixuloladala.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 17212 bytes
SHA-256: 5338190adfab8e3954656b5b5f76acdb933267941f0813fb846f875eecd3110b
font_01_sfnt_off00012ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA4 11336 bytes
SHA-256: e9b8670066cdcc586e8d25275dc700d78f57c5c019f8325cf22b77c15fe98632
font_02_sfnt_off000148b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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