Malicious PDF — malware analysis report

Static analysis result for SHA-256 591e0f3d48f8d46b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-23 00:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdcf0bf21b519e9509a8c7629a48dc4d SHA-1: 5237fea5329a0eae6ef5c6c9415b25fe5b3640d0 SHA-256: 591e0f3d48f8d46b4b479380d7d637db087a26b843c825afc86269c37e7c6df4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The presence of embedded JavaScript and the ML classifier's high confidence score indicate malicious intent. The primary goal appears to be redirecting users through a series of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=smoothest+android+launcher PDF link annotation
    • http://meta-min.com/files/98782056194.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-10/20210910220823473931.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/girevoxotu.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/kipiseweditizujufenu.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/44381424239.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/fetevaxerokuxekevubaxomer.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/54307626399.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f360db5844---52293603710.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/dasevufotuborukowiledere.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/45644032964.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4hvhdhncbac7femocf3a1rgedj/mesuditixifum.pdfIn PDF document text
    • http://edituj.cz/res/file/33446032867.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wabivuwesolu.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/nisopixusuw.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/65130984074.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5c2e9109e7ca1b7109979d743de4ebd2/89111347533.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/19540454984.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/57737867455.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/dididowekoditosodaj.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/27353415018.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/56817783384.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/pezuba.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e6d71c1181e18812a9829c40fb5e7d4f/29540204674.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/37371048724.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/11086650858.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_off0000d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 17488 bytes
SHA-256: cfbe74ea8e3bfa6527b030b15b07ec067c9b4fa5184cf390ff022934cc99c556
font_01_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 10808 bytes
SHA-256: 2b3f554833652e55c6dccdb37e20add3fec1368da7a68460886e1450ab57b6f5

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