Malicious PDF — malware analysis report

Static analysis result for SHA-256 82229a7dabd14596…

MALICIOUS

PDF

72.5 KB Created: 2021-06-13 21:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45407d427389a2831f4f99ec17b9393d SHA-1: 4cee81d64d6cc36d9e1d287d79b39a91282159a6 SHA-256: 82229a7dabd14596b08e9a55eac8e2f49d3490c1f17653cc7406d9c817e794bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The presence of 'chess game offline apk download' in one of the URLs indicates a lure to trick users into downloading potentially unwanted or malicious applications. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=chess+game+offline+apk+download
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bs6iaf305f06icavesb4hcvlt4/55363408480.pdf
    • http://kibbkw.com/uploads/file/kadixupibo.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c37453b0229174038b8a636779039245/dazinakewodeb.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a6b41ef961f399505fd56af3702c511f/tajibukarepa.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fa0c1499211e0a6a8dc62ec9b766ca78/gurixesezizepetunam.pdf
    • http://fkhd.cz/data/img/komozejepegulagarazer.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f7c25cd0c2d6884c0ede18aeed57a8f5/poxixegatu.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7e2438318---tezasefaxida.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/71f05969d4bd59ed9f6c1097b06305e9/88484843594.pdf
    • http://younewstoday.com/task/userimages/file/bipokuseg.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c54670c6ff---15811746481.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b50d6f71599---27428183447.pdf
    • http://mnogonomerov.ru/uploads/file/wubagexofadabazup.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/99741092658.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738ecdd90b4---66387382994.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/02846c26c8a1a5061a7044cb979cc921/vifeparabesufudotuto.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d2c83c17b2db2533b14cbb3bdecf4058/xupalililal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb9.bin
ef47621eafe6c41db6f61fb0896d016e6f80c2fe40e77392bc5cf8eeb58a68b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 5420 bytes
font_01_sfnt_off0000f114.bin
460aaaf0cb732f778a3cfff04b2455300f87ca51a955ba8136fe0fb638a6e78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 10608 bytes

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