Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5e4d9929e115d2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 01:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: becd016b6b6cd19f7f412276671ce6ac SHA-1: 8e5e22c98ab3b6a049756da5c67bd60f19035b6f SHA-256: 5f5e4d9929e115d2fd0f24b7ac9693ff5e77922ed809a4a3cec3d248fde07e4a
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection or exploits a vulnerability to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://3qlohas.com/CKEdit/upload/files/42049233668.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d7d18b233d25bc16513818d112ed31ff/60868075951.pdfIn PDF document text
    • http://e-district.org/userfiles/file/18626284060.pdfIn PDF document text
    • https://securitydm.com/slicice/file/xofopaputevuxebepovanibu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a115d781438---dinowujufeg.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/0d3603b33de87ef32e590f31060662d6/kovexudolokunuku.pdfIn PDF document text
    • https://artbynela.com/uploads/file/ritejukojajupapujazepovil.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/ranimomexad.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/3841614001.pdfIn PDF document text
    • https://servicepapik.ro/files/54724680086.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/joralomirasipizusejivevo.pdfIn PDF document text
    • http://esistore.de/userfiles/file/95553765674.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/20659268178.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/wabemesaviwonuguwefewudog.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078724b666b0---57332702959.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/78ea1798e29367d607b90848a1f0737d/juzixejurapakigitu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5412a814f9f5b412ad3d9a15d4c23e9d/48515516632.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097ded00153e---38893400475.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fd2d2f1d9b8539ffe576c2107f638cf9/48013230452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mesin+kopi+espresso+manualPDF 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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 18000 bytes
SHA-256: 02ddd647af967cdf770a9d0b21321a8b54155112cf44f016f94337308b42806d
font_02_sfnt_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 10500 bytes
SHA-256: 2e7cd623c9d1c4fda60639515138a3c15209edd49f52cac2c38e4bda4b0e68ae

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