Malicious PDF — malware analysis report

Static analysis result for SHA-256 86493a37f646ab98…

MALICIOUS

PDF

73.8 KB Created: 2021-07-03 00:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f275a08ca0ee852b708ca9beccfde83f SHA-1: cde03ee3a0e1626e24d418bc3c213ab79e1f7647 SHA-256: 86493a37f646ab987665f1d6598bb8cf74577dfbf694519f8c5be32fd3465886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=tourism+3+student%27s+book+pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43da0613f1---jisozuz.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608438298eabb---fuvatewemifesidijubitav.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55d79ee461---lukezuriri.pdf
    • http://alltechsro.cz/files/tusevijine.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/54bc4f951b0d9055a1616027a7e43c85/zowozuwufisujizesob.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/466388961fda881d66a7cd9cb6e48279/zorajenidejakevedamanow.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf4bb21b2---nokamux.pdf
    • http://stinpo.com/ckfinder/userfiles/files/69257842344.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1l0e6uukjebk5ldbsi33tdb3t6/zulak.pdf
    • http://wskinbody.com/data/boardData/files/97925213862.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/42209754230.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bb4ad34f8e0a078f7611faa4a730efb4/94856697741.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/780ddf40d83bdf2a55b8af5c6c1edf36/82061090812.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1a767922---zikuwuranemiruv.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160866fbd3ab56---98935052809.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41cd8217fa---fudilosetadapeloluxuteje.pdf
    • http://bsinteriordesigner.com/userfiles/files/16656241330.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160caa4fe678ad---davodinimabezupib.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/36b08a9f92d776c09f331dd02939182d/4333914514.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d72c457fa482bb3ffc58021f954822f2/93327085819.pdf
    • https://drvishweshwari.in/userfiles/file/94309762271.pdf
    • https://partnyor.az/userfiles/file/gexeniwosuniwopibes.pdf
    • https://suma.ca/upload/editor/file/91912768733.pdf
    • https://asiquim.com/ckfinder/userfiles/files/mutog.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a559e28b38---marifarerin.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8D 16792 bytes
font_01_sfnt_off0000d69f.bin
0aeda927c1c7e77222ee4279c69ae76aab375bfe2f799f2deaf9d08767b3b481		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 16656 bytes
font_02_sfnt_off0001009e.bin
8758ad2c16c99a443d3d42c9aa94fc35bc9150d8a9fb650bea23246641a0689e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 10952 bytes

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