Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb75c4e456833a3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 15:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3e17c2f350783fb6865113083f13e2a SHA-1: a0671c9833c0ff0985d5d489c83b4c32dcef09e3 SHA-256: ecb75c4e456833a3f04c42ef1b7ffa610c1f76655582e07da1d8af8f2deb1e6f
96 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of multiple external links suggests an attempt to redirect users to potentially harmful content or exploit kits. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://aqbnb.com/uploadfile/file/sinuti.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/18b7d7755e32f2af63177f87692f4b06/56499324636.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/2588409803.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/rilabom.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/29104051869.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960d14e0d4a---19082502512.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/woporufamarawifosinub.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160754587ca937---11105054210.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/pafigigugisutekov.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160726ce06f532---nitizunupuludo.pdfIn PDF document text
    • http://webbuilders.com/files/file/xisamipikakugiwutoze.pdfIn PDF document text
    • https://scalping.ir/data/files/file/97213896191.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0c40699072a95a11430511bf8f6b7bf8/58014009408.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/47201317521.pdfIn PDF document text
    • http://jngf.cn/files/file/tipeguxuneledapojeki.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/zudadazulatuzop.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607761e8b302a---84627447939.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6bd6cffe---mubuwatavowajama.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/23589885731.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/70672221681.pdfIn PDF document text
    • http://arablift.net/userfiles/file/39673572555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=corolla+xei+2008+manual+tabela+fipePDF 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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 18704 bytes
SHA-256: 8cb434606c93ece79e8a81e7479bafaad7fd185a1d1ec785dabf26119a6dd28a
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 11176 bytes
SHA-256: 18e1f37de1a89f622dfcfcb1433507b34b3ceb2be47c089f332ad2e354fb5194
font_02_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1