Malicious PDF — malware analysis report

Static analysis result for SHA-256 97004b2dfe95176d…

MALICIOUS

PDF

94.6 KB Created: 2021-09-24 11:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01b76107e5bce81188fe5e67741c0509 SHA-1: 8919841859c6f40a18a27f924c6794ff4d9708e1 SHA-256: 97004b2dfe95176dba834623de6acd3d3023bf066507057798d9fa3795c53f0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://asid.rw/userfiles/file/rufozunuwubetekudixazavam.pdf In PDF document text
    • http://studiogaleazzo.eu/userfiles/files/semidu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161445df9c34b3---42026993607.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/nisesojetakudus.pdfIn PDF document text
    • https://cian.hr/userfiles/file/20212310292.pdfIn PDF document text
    • http://pinxedien.net/upload/files/42623069456.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/jigomazopoturusubaso.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/74332951897.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/16985467477.pdfIn PDF document text
    • http://zenkatsu.dk/files/wibasudoxix.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/99635311436.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/vozunag.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/96444425628.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/84450537318.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dcead2efe---45798644931.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/2489835641.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/tefexevexeke.pdfIn PDF document text
    • https://businesslife.com/content/files/jefugaxejojuwijiva.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/87122434316.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/50903400047.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/kukivesawewanawukake.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5cdd039f2192fc33c3121092f0807c33/2490551848.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/xodevuwenumizezi.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/vitunure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=instagram+mod+apk+followerPDF 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_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 18468 bytes
SHA-256: a6d07adb90a8e69246e2ec44081c2a7d13a92fe97ac9f50a5ba4c44b3ebe2499
font_01_sfnt_off00013c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C26 10880 bytes
SHA-256: 3fd24ec95065af87276f3b6a5c742bc9c3c6f840499518859ea11add7de58ef1
font_02_sfnt_off0001552d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1552D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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