Malicious PDF — malware analysis report

Static analysis result for SHA-256 530ca96127cf0924…

MALICIOUS

PDF

82.4 KB Created: 2021-07-19 00:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e28c68f6ed15ef4ffcb240bb223fdea SHA-1: 7dbfa8e4781489043453b1bd2e6b5d61278c4fba SHA-256: 530ca96127cf09246c8558f335fb9a1489bb30d0b11ae80a60f59f69a33471cf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/42cbca2ebaf15f4dd1801c44a3ffa767/76384099318.pdf In PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/49635367410.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gonolinige.pdfIn PDF document text
    • https://soechi.id/userfiles/file/14787517970.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/parudemojavewegoliwuz.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/2fd13gm84gqr162f6s0v88gn10/36953849718.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/lf0uhm8c99pecdv00kspogu5dk/58990594930.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/41185094886.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/kumaporo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0mblo7q5j31632nr3nvc0q6ktv/91325891303.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/14326713099.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6e1bb107---1415204535.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7eb4271---vupakopirevuxepujotapew.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609654b3b4af8---28588675068.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/xudete.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bae7958b---13587294007.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rr640eahkv16f6vlh4e3oma0pv/24318996626.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/00137c77bd125560822106fc37b86b06/5596833863.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef40ad72a6---gexelefezu.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/mevidiwirogimuzoxejowexik.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/lorewemufol.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210505092249190.pdfIn PDF document text
    • https://educhina.mn/editor/files/roxudebivororadoxumuvoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+multiplicative+inverse+and+additive+inversePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 10820 bytes
SHA-256: 54e37946dd7f2a7784647442e8cca56d0b751da53ee02863e78983e8f9f3b28b
font_01_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 19144 bytes
SHA-256: a97b6bdfb6cd04f6c07f578e40bd41db077f6e50ab1a0a3fa12fb15ef4f596d3
font_02_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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