Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f3c571bcfc6e5c…

MALICIOUS

PDF

81.5 KB Created: 2021-10-18 00:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9348d43bc7b72b5a2433040b625d92cb SHA-1: 632adcfd56fa8b72759b174e4ce8d0a66dd270e3 SHA-256: e2f3c571bcfc6e5c0bff64fdef354d6521dde9a7d1dcfd3ece69d8ca6f5fca53
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 or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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 https://bandotrading.it/uploads/file/66892664008.pdf In PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/fupobimi.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/20275332179.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/42738597046.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/79833948598.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/28584317741.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144def3e01a6---vonekofabibibajeliba.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/62068511609.pdfIn PDF document text
    • https://eurotig.ro/file/40785257232.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/fatotewatin.pdfIn PDF document text
    • https://koratspring.com/upload/file/14503947529.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/novikasagugezikolomadogi.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/rozisopumavajimug.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/98325852045.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/funewida.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/e608tt1bac97mgtgak9mmms0r4/sakaxonoxarusenabizafuduw.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/60183232048.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/47155271631.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/bunedozolibamuritotomibaz.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/16961993692.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/pudawejivelivetujetip.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616b58d3cb01c---25544193318.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BcFPVxLj4jw/uplcv?utm_term=aashiqui+2+film+all+songPDF 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_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 10680 bytes
SHA-256: b7e428cd3665a73b28b046fe4594b960e3fdba8331c32dbc899d50f6ceb480bd
font_02_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 17712 bytes
SHA-256: 7d0bf921498e3d27cfe01fce4a0de14f1e285bfe8b6f6b3d893551e8bd391161