Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10f4045105f6cb9…

MALICIOUS

PDF

98.9 KB Created: 2021-06-12 20:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9b497dc56528b05250da8a2d4685ce5d SHA-1: 161ecb23107a9c225082491fb78a6b00bc9a15c5 SHA-256: a10f4045105f6cb9cc34948455a5099bff01ccbc8957e647a426f40e83dec381
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=o+mere+sanam+mere+hamdam+dj+song+download PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6f388a02---6682577410.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/cf668e813a03ad4dbe491deeb4f3e5d6/xatugujalimajiwenojo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c714a4fa9---68946685218.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/951699e5b0beae25fa29526e9d8746f7/tavabubipo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/80f4e9760b39234a9ae805a8468cd715/pixakokixadowuvunamuvom.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a66ab4ded2---56532316084.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6f6cb79b---sinanogetutifabizoz.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf92b948815---87547211487.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609245500ed44---35396293679.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097591b9be4c---62622388187.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/80455791930.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/85f86f62dab998bc620b48f93a054a2f/5516795486.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/fv88kk2olr8kivf3pi04a9u3g2/vusatipetamefiwafewojuso.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/cldakjd7ttq7mapqj1kfvhqin0/39025188845.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b922c6231---gazamafofofikes.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/juvulozurezabu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f72e7446b---ziretinaxu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079c4d4330c4---78725286729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 8544 bytes
SHA-256: f953c141b44aa07488c786739daa889a158f95d46310c3d86dfce219e1535fc5
font_01_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 5436 bytes
SHA-256: df8a73141e313dc58e677641a84b4050a6a997be2e56f1956a4da28176b2ca5d
font_02_sfnt_off000116ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 2204 bytes
SHA-256: 6f2123a68def04bf1161dd97896fb0f15083fc2f3748534b4d954f3ab8e9de5c
font_03_sfnt_off000120e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 11100 bytes
SHA-256: 9bb7fc9a180c5320507eba8b98e5246ea552a8f6c2228d4226a4908284555134
font_04_sfnt_off000146a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A6 19940 bytes
SHA-256: 791ba4d71606d890d59d26db52ba6c1a63b21b133ffc5a9e2d536f2ea14d7135
font_05_sfnt_off0001678c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1678C 5504 bytes
SHA-256: d29103a9e97003f0698c0e9cdfbc127bc5e2e801617713adb29bba72ce9ce3d6

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