Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d50ec4828b9296b…

MALICIOUS

PDF

95.1 KB Created: 2021-08-07 22:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9cee267cdb8fc59e0cdb0e52eaa154e7 SHA-1: 56f97dec388a4e777902580f45d94ccf970b8233 SHA-256: 0d50ec4828b9296bf93328ef5e7d4ab6494dfa8f414be4b6945bc68bff19f6f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to obscure the true destination or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/afb30b7e1a09f677f1fad5fa41b421c5/6330940696.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080927cb6f04---24368862687.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/tibutikujoritamipix.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/55679062316.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a0acafe4a8b---xivini.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/58077718993.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a247ec1a54---waluwegaxevemap.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210727223025302.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a62fefaa57b---83899525742.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021070502162973499.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/41941115086.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/2165153621.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/lumixodumis.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/70752411088.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/16056888090.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/88cad30f9ce7c57ca2c4e66d5727aa47/fabebofewelufebesiwujamar.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052800561824.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ebc35fdc77d17650ae142d15633156a2/85793727347.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608eedf0b75b5---47258789886.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5cf97bf8---25070387600.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d02d2db452d---14006948225.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8f7102f2---favalo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zejobuvati.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/xoworabigamawub.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf0b50d92---milatidowusuxon.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/mivekogejofowoveropobilaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pathfinder+kingmaker+the+price+of+curiosity+time+limitPDF 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_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 11376 bytes
SHA-256: 68c90fc37fed7d017e0b3d3441183f854cb5d460f50182349aa62e723fec37c9
font_02_sfnt_off00013c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C21 18884 bytes
SHA-256: 6e2886feffa141000b2c85aa720a7b037447261789cde8ba7cd18c5fd31e979f

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