Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a493df4f2f2c84…

MALICIOUS

PDF

95.5 KB Created: 2021-09-04 17:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c79957a109e73e0495ec540c1c1e6d9c SHA-1: e72eb690bcc20776b8df3276d8877c262f8ad000 SHA-256: 74a493df4f2f2c848286d9bcf2e7dd86e59277279d5c92360f4651218a4dd4e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links pointing to compromised websites, including those hosted on disposable domains and compromised CMS upload directories. These links suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/geligenenodipodeme.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/e654a02900a626c91e8943c567caa28c/tabigegox.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/47696791100.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6caf35cf---zixawufadinomili.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/nobisikusosufifes.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210601062158.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/56855242786.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838cd2d21fe---71141256682.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f369764bcac5d44d495bba2c23a8c27b/73110013910.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b759aed2000---jujifiwobefididexitevew.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/viwapijagexukade.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/50216031126.pdfIn PDF document text
    • https://clinicscrm.com/img/files/piramufupabesumoju.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ed32518b---72341945742.pdfIn PDF document text
    • https://akemi.ro/hirek/file/mofifoxomopixe.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160968440b29e3---bepupejetofiretazeg.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161235d143930f---43927409283.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609102c8ea058---xavekikuteweka.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/52496602638.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/38832691797.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/nn5uk29omfg81g4jk5fou7p3l1/zoforerub.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/kitukugewadivujizoko.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/10476eed93645d4b0a09f1f2d812afa7/97056607262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=solid+figures+geometry+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_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 23004 bytes
SHA-256: dbaf4e3b0bee66a6a239bc0a4bb7c10e146b8e63eba726ae10b6ae1d1718f260
font_01_sfnt_off00013ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D3 11000 bytes
SHA-256: 9e80f4c7ac75fbb3804605c4b7a9725c415cfa672207be242215455b841a2b98

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