Malicious PDF — malware analysis report

Static analysis result for SHA-256 188d187be85eaddc…

MALICIOUS

PDF

68.4 KB Created: 2021-10-02 13:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 78a6ef7a206914d441b1ed47983f1364 SHA-1: 5e78409d161427cdae5d8dc84724c29fd7328253 SHA-256: 188d187be85eaddcb8af6bb502c32b8f1b54b3b2cbc601399341e393d8f1a2bd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV. It employs a common phishing lure technique, presenting itself as an image to trick users into clicking a link. The embedded JavaScript and numerous external URIs, many hosted on compromised WordPress sites, suggest an attempt to redirect users to malicious content, likely a phishing page. The primary goal appears to be credential harvesting through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63990702647.pdf In PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/kijigepupoli.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/24267352691.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fdf6479723d117acd59af296d6e933b3/furipavimejegus.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/20134222502.pdfIn PDF document text
    • https://pecsikult.hu/files/file/mewewalodo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614211a0a96ab---34336123819.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-11/images/files/robewabi.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/69857688454.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/midalelupaguradipiwi.pdfIn PDF document text
    • https://thehouseproduction.net/file/63522073403.pdfIn PDF document text
    • http://etre-belle.su/images/file/jobazuviwumixizupubaxer.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/fof77hecrn0rhjlpu39p2fua25/sereburukefawexiviba.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/44416751705.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/libupisise.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/venizugun.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/35274997549.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/57068028972.pdfIn PDF document text
    • http://4bx.pl/public/file/32680516643.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xuluwotevugigo.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/jafisakemeti.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/siwefiwatiteza.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/moriv.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/93ni71u5575afe86pog8ee46gv/74498432883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+build+a+moving+boat+in+minecraftPDF 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_off0000af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 14188 bytes
SHA-256: 1ef5ea85224c19a3d721e23f1ecbbbbbea7215fd1eac3dcec6eef4aeb4f6aab7
font_01_sfnt_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 11036 bytes
SHA-256: 655250b576f634385c4d856ee946afa3131de4d2364fb52d038bd4f01fef8fcf

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