Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db9536028bef1f0…

MALICIOUS

PDF

87.1 KB Created: 2021-07-13 17:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38f4d419daf6967dcee62c8524bf63a5 SHA-1: 0cb616c7909cfa9e3b3acc73c7d0022a10576087 SHA-256: 4db9536028bef1f0ab530aa1b4b21d00a2b5aafd3ffced5e84e88315a9443e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8bd229d9b---74040289133.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da2b7b2c0---61038024943.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c685ac38e59---jemabugogirujusapawimib.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2jp76qp2dte80b3asg1l8lvtgj/76452191791.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9557a8a27---kuxofirofuxagofuzene.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ifbur0mslooch091ttm6jdkpd2/43447770254.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/peloriwasabawa.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609813b775b79---lenejukegefokozad.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bu22h1mc7ltlr6c7di2lmfgf9u/mejexonojoxelitoxi.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/umeo8la5fotdlkjdmvgn4eomn7/21023773112.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8357a6daac039c3e05a875e74bfefa9d/zinopasidijuza.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/vonukakikupusij.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/rejizugobevigopez.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/jezivivorusuzafa.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7fae57ac21cc01b5513143bd00f7be96/17365194045.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/konutujar.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/h3cn86190a9ancufnk6fue449d/81590035443.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/n01d1v2hscne63lor9kc397p0u/70470379387.pdfIn PDF document text
    • https://luminex.pl/upload/file/kofewarerisidubalonej.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed54aa0c3d---56905197156.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/qo26uvpoeecs6ju4j6q8qdpr20/81005685514.pdfIn PDF document text
    • http://ahchala.com/img/file/18190414143.pdfIn PDF document text
    • https://bursac.net/userfiles/file/62773590078.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/61ba7ae0fdcaa1ab152d3dfd19f2aeba/21234475281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=overhead+weighted+sit+upsPDF 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_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 10680 bytes
SHA-256: a823b3e420a4aa3b3f7994037e03bf5301c532e08cfb973d163b1b52036b245d
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 16184 bytes
SHA-256: f4515772da2c8e820781ece8002ca857dbf9978348b44d717a4da990d8448ad4
font_02_sfnt_off00013754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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