Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea081f000f77750c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 13:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1e8cf492dfef4c5902158f1516ceb76e SHA-1: ca3bf4aacf3d0d08066b423c56ec5a8e4cb2c2d4 SHA-256: ea081f000f77750c4b0030845701f4fe0fd4f32f5aafad8855dc24e8311bcde0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=s2+custom+rom PDF link annotation
    • http://carbonelite.ru/file/soxomilomikisopudijob.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/90d4b213a19ea8d860678a4aaf412220/disuzimavilifulezev.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24930852618.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210902_55399ECF67A584E1.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8312be17af2bd0d93f47cda3360d0d73/59916134054.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/mawizutunevifoxonet.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/tuwidaperagonigotog.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/jijukuvixojekukala.pdfIn PDF document text
    • http://orem.mn/uploads/files/32737892027.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/nutowibadetutusidu.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/89930235567.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/78974988985.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/vajogexonekomopodexoma.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210924152145_f9ll9g.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fonasijukenopavixivar.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/83057450198.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/44617065826.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/2083442934.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/83204900735.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/toxixelekarurajuko.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/zedudunuvulitu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/28412719624.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/rijug.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4269d371fed255b92de938dcb3d228dc/1317703993.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/dusizikujipokugoxob.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_off0000b059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB059 10148 bytes
SHA-256: 39a43c17b6e7225ce212054113ca4d681c734c40f38eddf1a426a6e16b374eb3
font_01_sfnt_off0000c71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71A 15856 bytes
SHA-256: 72b8c8e824a43e513b1375e695497e6a97c8726560afdbe936c1bfebad5172f6
font_02_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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