Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15073627a3981cd…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 18:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a48dfd9ac749a00d65564a557702e53a SHA-1: 61ab16a685a7689874f9ea87c07f382e5ed14676 SHA-256: f15073627a3981cdf43de38c3f45ba06ca6727917d5857cbe62bd7f53287ddad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=combine+messages+and+messenger PDF link annotation
    • https://interstudy.net/userfiles/file/26078429147.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090318245773499.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/60881711889.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/garaxiraluxi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f300ee9b2a---rawukafikutiwololuxupib.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312567e10c6---77471684549.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/47813089920.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/58853262157.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/75999229731.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/b5jchms68ogv7sfod1k7l4eajh/neviriz.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1201b41d14f63b1008b30c3809c3be2b/61677536491.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/torezi.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/lopamolivibug.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/27004746953.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/19991504267.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/rijufomibe.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/bawofapewugowukisefo.pdfIn PDF document text
    • http://webursitet.org/Files/file/94521408896.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/raguvitanupopotaridedap.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16308133677271.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081ba74739---22478848949.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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 10620 bytes
SHA-256: 411056b439f260f29b602d265594ea247664be4514cda30145e113ce0598a19d
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 18368 bytes
SHA-256: 844bba168a0b8afa1dcd141681e4f7045e31ed513457df7c6cb57b6ba63ee68e
font_02_sfnt_off00012916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1