Malicious PDF — malware analysis report

Static analysis result for SHA-256 340e876e3ea6c174…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 19:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c788058d8c8260bf4c408d4c33ca78a SHA-1: f3bd1a86a0c3e16d5a43752ede5d81254d982227 SHA-256: 340e876e3ea6c174a6729f7fac83e00ea4b685b1b365d370266720180ebbfd0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the presence of a link farm pointing to compromised WordPress upload storage suggests an attempt to host and distribute further malicious payloads or phishing pages. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 https://farmacieitaliane.com/documenti/file/5604187990.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161365650db50e---89548918018.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/binogilikarodifuneg.pdfIn PDF document text
    • https://mfdesign.hu/files/file/viserobiruna.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/64505157676.pdfIn PDF document text
    • https://halkum.rs/files/zusakofiva.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/11696156918.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/47182308895.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/virogawozar.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/46996718901.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16138512dddb94---giwepolokemimenab.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/tatip.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424f47b5781---19747621739.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/51880631592.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/78648515023.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/jozofibuzolojafov.pdfIn PDF document text
    • https://tch.lu/files/files/kowome.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/sorolewa.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/28131489265.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/20016794679.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/lataradeduwekiba.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/vosezevu.pdfIn PDF document text
    • https://ekransamara.ru/files/dekivugazifavov.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/mepip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=envision+geometry+assessment+resources+answer+key+pdfPDF 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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 11360 bytes
SHA-256: 9f17ab436dcc3dc066051cfee4fb86722b7675206dc9b35f250e14f134dfc82f
font_01_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 17900 bytes
SHA-256: 4c75bfcedcf8844a04b4911e980551cd48dc138ed43ce9bfde0d81ed56fecbfa

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