Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7da40ac7b71570…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 11:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dd1f9a2432117347e69c89970940253 SHA-1: bfd9b8261b3f9033303ef605f9414bfaa33e8f85 SHA-256: bb7da40ac7b71570e117ea72098eed0887af406aec590b8b974b88f91274b466
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious websites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=wifi+strength+app+android
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/t1o3isj3vd9an9obdk078fikdh/toxodaliburutujoserileki.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2e80705e---wapuwetikebenogopodezej.pdf
    • http://hongdanhaudio.com/luutru/files/34541170173.pdf
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/57459237132.pdf
    • https://interconformity.ro/images/file/42906377352.pdf
    • https://civilkontroll.hu/uploads/file/lidoni.pdf
    • http://mikol-styl.cz/userfiles/file/nomibatipepepufi.pdf
    • http://ilyxrace.com/userfiles/files/waparimebamitepozid.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/94552885300.pdf
    • https://whitepalacegrill.com/userfiles/nulilebukuzujut.pdf
    • http://neapol-m.ru/usr/file/54504550484.pdf
    • https://bomando.bomsolar.com/uploadfiles/files/3068181758.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/59375746466.pdf
    • http://sns.hu/_user/file/75422207778.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c4c8364bb24d959a4812c590c219c7e2/57303622907.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/066f7fbba5ba77b1c79a2a4aabed1f69/dapalekadefedefepumanog.pdf
    • http://dongshengcable.com/images/upload/File/paxomusakopo.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/35628636488.pdf
    • http://webspace.mysdam.net/images/newsletter/files/14773768868.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210910_8FEDCAE79E4E0350.pdf
    • https://posh.hr/files/52507258493.pdf
    • https://grootformaatspandoeken.nl/userfiles/file/68026160143.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ce164a037a6547089aed41ff5568240e/xigerojer.pdf
    • http://www.ezmoving.com/file/goxebefozupozibomi.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_off0000e7d5.bin
aaf2b91c2bb624ae258702151c385792b32e3744c7bcb6ca205e10fb055a586b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 19548 bytes
font_01_sfnt_off000118e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 16792 bytes
font_02_sfnt_off000130f7.bin
99c5bcc7fc5a7f212b3f732b8d8e66dfa0519c37ba023aa83127f20eefd43736
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F7 10724 bytes