Malicious PDF — malware analysis report

Static analysis result for SHA-256 82034321980a1e5d…

MALICIOUS

PDF

81.6 KB Created: 2021-06-28 21:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ca9851aafdaba88cb72fb17c1bef3da SHA-1: 27457db39bd8be28a472a64c255a486338055bd7 SHA-256: 82034321980a1e5d6cf9f08a029be7cf0a831b24e1a48c27ff1f3f14eaf46876
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://ascensionchina.com/userfiles/file/82932223736.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608157e324806---sufugexexuwewotelulezepu.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/41eot1p375vjnohl8orobvbkin/tazerobupafinoxofiwipifo.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/2bk6qkg9ftanghhgd2tptmfelv/73334579671.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a4877c8e9---liwesanodaxipabakutoligi.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/72da2adff0a215181f53c1f90e84bedc/rigafaxuz.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/730c0748e710fb32c43a2fcd2462e601/61933467589.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0c6cf1dc32e5e0be342da718a866e7cb/30383429123.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9d606c2f0056d8cdf21e6b9bf62eb86/24706349465.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acceb841efe---nagamiwazibisezeboroj.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf3fb680f---27981105293.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2356290c8---23625967142.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4116fb5283---gopotutajofizufagiboz.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e8f34f95559e35abe043db990c54183b/68345515980.pdf
    • https://divinenine.net/userfiles/file/lojamovezesatiwonexopamus.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/75140372878.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ka887sh56iht4e1skku5mb3jvj/96823216800.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608874b7eab37---lagexixaruzegalaku.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffed4d9db---71901797720.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa127a0e2---61507269415.pdf
    • http://elitaliaweb.it/upload/file/4249151185.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074ffa5ab128---96363904415.pdf
    • http://ilkyoukais.com/Images/Media/files/sajixiserifuxewezerud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=factorial+of+a+number+in+php
    • 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_off0000dd29.bin
2d864ba19435ba3da4c9b4e7564fc079c5cc7bf2894f48e1e1330afc9b914944		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 10796 bytes
font_01_sfnt_off0000f58d.bin
183e5e0b6c94856c56fec4bf5a42753a42c71b49df8c1ef120042c705c33825e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 16720 bytes
font_02_sfnt_off00012151.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 16792 bytes

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