Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d4cd99c9b9be5a…

MALICIOUS

PDF

83.3 KB Created: 2021-08-07 15:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ccbab7f1c010a826b911876585a6f7a SHA-1: f0a9f88e8b1767605163ef1ae6a36b195d28bcff SHA-256: 36d4cd99c9b9be5a7818f3dc1df9bba47c52843933584372d648a34b3a7c294b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, 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 exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://atl-50.com/files/file/varakudojag.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/accb597ae1f7bf3f44ec91a10537c9fa/97680142211.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/zimom.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hr4jttikiq52qh0vb27b8qhc81/59779188626.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/t0em6gq3m6m02b6skp5mt5lo80/joginubip.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160903793b6e03---zedivezavedafuxije.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16097189caae5c---muzasowumoturegugis.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/93346296117.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c97fe8f3a---jadapojotusoxobuxubileti.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/85582744883.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/38102277235.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/nep6qkkgb7r029psl7v7h7vms3/86750359209.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/derivodatogidodusatuj.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/xonetik.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/nelavamidideka.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/zatujupiviv.pdfIn PDF document text
    • http://schokobrunnen.com/idata/13011570870.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/i6ll89o1vnsrivrt5v96dofhqr/46330099878.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/45882621440.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/2254971779.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ogui9gn52e472vmoat2bkvcha3/86236036054.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/xegepem.pdfIn PDF document text
    • https://bold-iot.com/uploads//files/202108031950153058.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/16i192vli1984p7tib1gseeekl/wazakuzomirevuzibiwililor.pdfIn PDF document text
    • https://angkalaris.com/contents//files/5098216058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=yvain+ou+le+chevalier+au+lion+r%C3%A9sum%C3%A9+chapitre+1PDF 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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 18080 bytes
SHA-256: 039c54f46203a2e88e4b2efd3dfcde42c0445d09197948f75554c7b127a37d44
font_01_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 10996 bytes
SHA-256: 4fa85e0d53febb1f1e0f8965be8dd1d4b42723a055062377e81dfc42ae0c4ba7
font_02_sfnt_off0001238b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1