Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce2c51e8dfe725b…

MALICIOUS

PDF

85.1 KB Created: 2021-07-04 14:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10ee4d3eb1c3a9dbcc344d79ef787275 SHA-1: b0cec4c7a13fe351164ffdf409e376469324ca31 SHA-256: bce2c51e8dfe725bbf660445b3cb77e9c8ff649fff365164a46fdbcd7aaa148c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised or disposable hosting domains, suggesting an attempt to lure users to malicious sites. The presence of these links, combined with the overall structure, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://esoftland.com/userfiles/file/82655742996.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/17623114539.pdf
    • http://aceonlinementors.com/userfiles/file/morobovojege.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceb8a45aa0---65821838252.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f8972797896d23dff186af358f3688ed/28755434473.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b341bf73d---22602942286.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a595fd29a09---35863511165.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/kobivuvivo.pdf
    • http://www.szphotar.com/admin/img/files/56520813120.pdf
    • http://alexandrapanayotou.com/web/images/static/file/56248870392.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39b4dc2e44---niteraxuwumovasurafewexu.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffcb960922---tobafisexupimem.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2961d93b5---laridesubarafut.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4e0ff51b63053c5a07ed88b752cdfd22/29331074208.pdf
    • https://wegofa.com/userfiles/file/97109513167.pdf
    • http://gourmethousemacau.com/UploadFilesfile///xotofekupiximutesiwenidaj.pdf
    • https://aronabritcan.com/userfiles/file/32228719948.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/sazuvafofudi.pdf
    • https://tort-art.ru/userfiles/file/18832564514.pdf
    • http://51-lq.com/userfiles/file///39630843955.pdf
    • https://twr1115.net/files/fckeditor/file/31441899059.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3227e2e7e---86513831738.pdf
    • http://www.celso.org/download/22198665560.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kphd402qnt13ku49cgog9dqs5s/15589897822.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/547ee163b2206a861b80b087a76c456b/75235920945.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844df5e98b0---40216794217.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=examples+of+self+pollinating+plants
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea24.bin
56726a12fa4dc7eed57d663ccba8867b85313d97f7cd1a8f33e39e58d6ee2c44
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 16404 bytes
font_01_sfnt_off000114d1.bin
e67646218efe6a160ee749410f37e2672779f8b5f9daca115badbba84b36a957
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 10688 bytes
font_02_sfnt_off00012d55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 16792 bytes