Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dffad4fc1c83ad9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 21:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ef0e737a32209621247de0451b77a17 SHA-1: 09f6e776f722157ab066fc4b3904aae3fe88376c SHA-256: 6dffad4fc1c83ad9d43a68a75c14c8882b219fb37ed8b9b22aab5a3ec40c01ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Multiple heuristics indicate the document is a link farm hosted on compromised or disposable domains, strongly suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0f529ef8b84177ad6ca22f700ddc615e/38076729627.pdf In PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/93991982903.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/53258204210.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/73712310899.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/vojiredazoxurif.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/lojexojixaxedatamevemot.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/nubafuripugideriketukiw.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/56274697530.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/munuvobazorobuvususijo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160708a7646077---wuzoxak.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ti5cb8188csmlti2kq9hd7lvn8/27359684854.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8a2e5a57---88144152015.pdfIn PDF document text
    • http://budka39.ru/files/bixulubedi.pdfIn PDF document text
    • http://crediramasrl.it/public/file/10456002409.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5aplgaisaqh4259skak8qsl471/49307536175.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589068976f---15120677518.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1b734df6be696d070de04c8c269f0d99/semelerirebojomiwegil.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/69577173238.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bbcdd0bf8a16624191d6eaf0c7e49e02/zibojaxonogirupajogikax.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4ddad4ad---zolimolubomozunupu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/kubide.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/158ucee17dm7ml7i5c43j9llco/dugofekuros.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd3870a17---87058097851.pdfIn PDF document text
    • http://email-database.info/userfiles/file/teziziwo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/vufukugu.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/lasufudowivodakogolamokom.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/vimebetemow.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hg55udfdi14j1211l6n2p40pm7/1267360404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=polynomials+practice+worksheetsPDF 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_off0000c3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 15916 bytes
SHA-256: ffc9a443ec18c10607581a8861238d7244a160624089e81321bdf7d4bc741361
font_02_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 10932 bytes
SHA-256: fbed0ddf900fb76361209cea0a9468c3133f52959db74b15f562897ea81e17a6