Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f638d0f095bdb55…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 21:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e52889f70dd63ad029716ed01c540b8 SHA-1: 2e93cf6098b537a8827f4a3f957157c32effc74a SHA-256: 8f638d0f095bdb55f6da80f52106c7a75e0e7439787641a5313b385106ff1965
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or link farms. The presence of JavaScript and the nature of the linked URLs indicate a phishing or malicious content delivery attempt, likely distributed as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.dawnrotaryclub.tw/UserFiles/files/72011774548.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/fd5cd0e06b657952ce02579dd7ef2e1b/takorigopodedulopod.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161323d712a504---39295879510.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/63623218258.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/64068402920.pdfIn PDF document text
    • http://agmapure.com/upload/files/kulev.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210903/file/16306840448554.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/fupabexi.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/gowobibozas.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/44492066197.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/wazovosexumugamaxatebedon.pdfIn PDF document text
    • http://ping-property.com/user_img/files/12681013946.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/56171805883.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/13546829603.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/59976830146.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/40695617172.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/83959996331.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e099a74c00---piriramelaxatoridi.pdfIn PDF document text
    • http://4darchitecture.org/img/all/10860451420.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/zimurabil.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/77336442791.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/tilaxotutamipusezizebux.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/dananasiwejobidomemubunej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+color+does+purple+and+red+make+when+mixed+togetherPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/67345704415.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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 11336 bytes
SHA-256: a9cba5e507d88043ed821138cd55e11a89dc4347418643b68b16e0980c644e03
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 17192 bytes
SHA-256: 964964371f2a463ef04dbca13c483cdd13546ce67729af1ce8e948763e8771d3
font_02_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.