Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea62e24b525ca52…

MALICIOUS

PDF

70.3 KB Created: 2021-06-23 19:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaeef24e1def36fbcc3de0c56ba98db8 SHA-1: b01806683eb8d1d7a4fec27b64c480e3c11187d7 SHA-256: 1ea62e24b525ca52de216bd11a1f8d7f6c9c3eb3be27c364649b1f8d8727901d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed88a0e767---52630969691.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab3d5dd97---pamusirigevitugowavuzi.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acf81660346---lekawebafuferilefugej.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/332bae82706c1450447e844cdcf2676a/tufosimuvunatizosi.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3bb442370f09ee6d09792a73a8b1726a/97171082956.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/713a8f617e690dd3c625420dbaadd58a/zulunovemotarujeruvaliz.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d646282e7---xavekexot.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a373fa9dd82---45062360507.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jkqoql805n3k0q0r5a140ht046/7580306818.pdf
    • http://hpworld.hu/data/pic/Image/file/76285746267.pdf
    • https://fentesmakina.com/paket/upload/files/pugutotutiditolutu.pdf
    • https://serwisnawigacji.pl/userfiles/file/24068214392.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7532cade2---39811208026.pdf
    • http://modellszerviz.hu/userfiles/file/zikaneteredu.pdf
    • http://grupophi.es/uploads/files/33853912936.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=questions+for+past+tense
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c8.bin
6da34b0b6f3c607f67c281c2c80440df9e8c710716a05a68a14fc92ae6ea845e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 4924 bytes
font_01_sfnt_off0000e998.bin
4c1883b892196aec117073a39f456d4c64f57c6c5949ff717716649330af45f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 10344 bytes

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