Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e4155a2721df12…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 13:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3851a347d2f3fefb517fbb71197e1cd2 SHA-1: ba5a910efb964d52bd6257378892585e9c7ca902 SHA-256: d0e4155a2721df121c968e2f9ee7b2aa18f0b7b8bd96a975669af37d4728ff5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, many pointing to other PDF files hosted on various domains. Heuristics indicate this is a link farm, with some links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware through the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=how+to+get+gems+in+dragon+city+2020 PDF link annotation
    • http://phuongsen.com/img-chamthi/files/nimula.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/lefosu.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/94558259294.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/vitepimu.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210902_AB0103F5128AA736.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/banokawefuxalidudavivade.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/veralugegoxuruse.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/897511p1nmsh3gg5fl50lnc6rq/53341710229.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/zuwakasofawixawewanubas.pdfIn PDF document text
    • http://enkepharma.com/upload/files/94490847060.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/d9nrlf9b6r0bvelh34tkkdpvpc/kuzotelosozatinasoxogaj.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/gakadusetawaxav.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18708098389.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/kavuxegeresedagimuzen.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c8acae0d---kifitapivibe.pdfIn PDF document text
    • http://1careglobal.com/upload/files/likixaramefowijedabufu.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sexawukupudilowapojube.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/suboxad.pdfIn PDF document text
    • https://tekmaker.com/upload/files/jepojudupokinosemimobi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/otu92tn1tojgpbn4krpmvtn4fb/tobokokugarejatufajigokoz.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/66008259840.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/rapug.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/zalufuxevil.pdfIn PDF document text
    • 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_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 11100 bytes
SHA-256: 2b82cbce70f3157b791f6e47f1847b9b83fc4f4d54380eca1a7316d77ba8fb02
font_01_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 17972 bytes
SHA-256: 01889ac20a7f1ba0f505c4a089dd31d81ef697ea6863e313f723f4460ed420d5
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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