Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed84d48b7d663b48…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 03:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0735caee7bf270e82acdc8b2172863f4 SHA-1: 7a60607ec59fecdc783b8e80bcd4e0a645ac6fee SHA-256: ed84d48b7d663b4867cb848a41b9e8980a778dad66b0acbc12c55540e67ddc72
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malicious content delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://yuktogel.com/contents//files/80875461408.pdf In PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/58346442858.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pugjavh7ld57l8qcfhnlgqgqok/wobisu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8019feed---pusopenomofu.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juwiwuveganuborosudoro.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/kefopajigupagadidod.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/1452062015.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/nejuxalu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/536l8qg2ufv99ff4u4t4qa4aeg/vesirironozolaxawo.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/38929464545.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/mexejojow.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/wovatefapireli.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160f608279fd4c---37825352615.pdfIn PDF document text
    • https://p87.hu/files/24199952812.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16117cc987a15e---zivapenisavuxurerutuvax.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/9301730052.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac9aca26b327a6fd1bcdcf7370bbcf51/85525091895.pdfIn PDF document text
    • http://yuhongzg.com/d/files/59719725692.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/turokemom.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/28115655346.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde6f43abb---bevetavo.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/sutumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=forms+of+government+scenarios+worksheet+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 17512 bytes
SHA-256: 2d09d76356f65fbd2eaac6a686347e181514f1ae8761eea9595348aa4c429c99
font_01_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 10956 bytes
SHA-256: 869645558183835d003a7754f855cc35f9137b6ef41c2e8fee4f2bbd7c8db0e3

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