Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e74e837ccb5e238…

MALICIOUS

PDF

72.9 KB Created: 2021-10-10 03:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb6968478772734c14b2fce0272dbb38 SHA-1: ac6ed7f11f84c169021cc780db8b12488a75d035 SHA-256: 1e74e837ccb5e2381f064c636c8b60d77deec5ecfdb265a9f1acaa98ece4ac21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://datawire.gr/files/files/79698302724.pdf In PDF document text
    • https://xtremefitksa.xbodyksa.com/ckfinder/userfiles/files/87422597675.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/83415272333.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109061935223210.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/97615525075.pdfIn PDF document text
    • http://sujoydhar.com/userfiles/files/vimav.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/sojeborarobove.pdfIn PDF document text
    • https://photofetimages.com/19952066100.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144139cac9b4---14368633995.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/97588207759.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/39919271067.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/61415460471.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/18127193547.pdfIn PDF document text
    • https://oz.korytnica.eu/data/files/fijugi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/7657099610.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/zanugalef.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/sanulalapanunorosu.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/fezidopizawomebifesebopap.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/88268701608.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zelilusuwimojeme.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/56464324000.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0b4f0faa535aed7f8b0d3af2ee716531/80219586466.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/8a859943aef36d3555ba642a5e9dbd8d/jodufuzujusaj.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/litufipenepedetavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=red+chili+curryPDF 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_off0000bbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC4 17116 bytes
SHA-256: d42d3ffb4ef28342576605af43ebae07e7010c72ae40cc677f6f64cfce38432a
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 10076 bytes
SHA-256: 47906e734f731dd651cda2157842133e76e7b167ee116325efbe3037438b4a57