Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3a0c016ca9c45a…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 10:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e36589cedfda264a596f1f5da387873c SHA-1: 52da969570b27800b79331c1d2c922eb3daf82b6 SHA-256: ef3a0c016ca9c45a5cfde687528f05a19aa4abde0fb662b94f184e095b26efa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, that likely lead to further malicious content. The presence of external URIs and link farms suggests an attempt to redirect users to download unwanted or harmful files, masquerading as legitimate content.

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://coretry.ru/uplcv?utm_term=download+chetan+bhagat+five+point+someone+pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ee3ad382cfbcfd300fab6c40dfb7a0f8/73630892021.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160946f3a3e67d---16484309829.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2656a20dbf050ae91607876ed413c451/fipagokakowazikixidufoxiw.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc36ea1543---jigugufixojo.pdf
    • http://4grd.com/cmsimages/file/79228822862.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5e7b932da416222aabd06eab8eb288cc/71556770447.pdf
    • https://samsungklima.net/upload/ckfinder/files/86804600712.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609122ac36680---28859542779.pdf
    • http://dolphinegypt.net/userfiles/file/25868935987.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a38fedb4e66---rabigalex.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4603cf67---32062219810.pdf
    • http://jcon-aps.dk/userfiles/file/zobupaxaxe.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87a515f2a---65283766603.pdf
    • http://harissarantis.com/userfiles/files/bipowupirawipazesuromi.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc184a2987---bogaku.pdf
    • http://xedaptap.net/userfiles/file/72228910090.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a538c002b56---kenogonidaxipojapiworogu.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f604fce613---bubimovijodadanirumerez.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8f8f00a85aae058f8c179bc5834dd993/37684246751.pdf
    • http://dribblebar.pl/userfiles/file/96022969805.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98a02e2b6---86743224852.pdf
    • https://albawadiroad.com/userfiles/files/7443910671.pdf
    • http://fszhenjia.com/upfolder/e/files/20210529180645.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450c02623f---19131497659.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_off0000ebef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 16792 bytes
font_01_sfnt_off00010401.bin
d14ab506752fa7a961df1eafd28faccb000d3a3250ea287ea830c0db1ed06807
pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 18088 bytes
font_02_sfnt_off000133f3.bin
6db513cd8aa08a4b9e74a67285706cfc309a2dc8ee91a5ce3795ef18f8fec52d
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F3 11260 bytes