Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc00bd1dc72e8cf5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 10:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab8e2c31e68c03a06ea2884627bd763b SHA-1: 49a8115759570c320882df61929429ddb6ec0d4e SHA-256: dc00bd1dc72e8cf5a9f8c1322b8bcd339342dbc761191ed4df2598d21c535654
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains a link farm directing to numerous compromised websites, suggesting an attempt to redirect users to malicious content or exploit kits. The presence of external URIs and compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=five+examples+of+word+processor
    • https://kingdomofgodmn.org/userfiles/files/85555814973.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613255697f280---mikewojoguvowewuz.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/og94fii5tiiadkb4s0ib8d7t3q/46007282910.pdf
    • http://master-vin.ru/files/file/xaseverafomodizabumubabol.pdf
    • http://hzeiger.com/userfiles/file/xelebezejel.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3329dddf---33659981197.pdf
    • http://bangtaisay.com/uploads/userfiles/file/vaxofizapakukefuwuvu.pdf
    • http://zamdq.com/filespath/files/20210903131750.pdf
    • http://jljemc.com/upload/files/8743565170.pdf
    • http://xsjsbzrw.com/uploads/files/xuzedixerakivelikifagov.pdf
    • https://autonoleggioassereto.com/file/45903368609.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/js4140udhk4f1s486t0om22hao/zesavenifujopadovode.pdf
    • https://funcarele.com/ckfinder/userfiles/files/2109020836.pdf
    • http://thienlongadv.com/upload/files/nimox.pdf
    • http://thedewakohchang.com/image/upload/File/arodokobinun.pdf
    • https://berettyotv.hu/userfiles/files/ranividefuwateza.pdf
    • https://vienhung.com/webroot/img/files/xinoge.pdf
    • http://taiwan-casters.com/userfiles/file/81567434710.pdf
    • https://siltri.com/fck_upload/file/dagixubuwekiwilo.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161369d9b259d5---73320119817.pdf
    • http://rowerowaszkola.pl/imgturysta/files/bawafozovumujemotab.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134452492980---vabusinulekogosafexak.pdf
    • http://pytextiles.com/userfiles/file/17714693429.pdf
    • http://gtlfuelmarine.com/userfiles/file/18779497453.pdf
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/gogidagatalobodu.pdf
    • http://realestatespoznan.com/uploads/24156608777.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_off0000d71d.bin
99db030d38d1f448208cf23b26325ed2b82f65a320485efce2e8515e9bf1fbb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 10812 bytes
font_01_sfnt_off0000f01a.bin
c447b8abcfd236713c1e04740d51a89c3a41a96882bc726247de1fee2aaef34b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 17600 bytes
font_02_sfnt_off00011d8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 16792 bytes