Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf0e9483d1c2343…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 18:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a98819eb377789bb80cb3dc9dd0f92a0 SHA-1: 21686e21366cb705b90197e6605ebaae31c908c6 SHA-256: adf0e9483d1c23430e3d78e1dcead68be00b49fde1289f465cd9ad3ed709061d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=hide+incoming+text+messages+android PDF link annotation
    • http://agcslohian.com/userfiles/file/20670545058.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/jijodujibumipafaxisekuw.pdfIn PDF document text
    • http://preprod-proximeo.com/ckfinder/userfiles/files/suxajal.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/72515478991.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/73084721501.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8v1oa0jbq0bvuuifd8iu13gqep/kapese.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d8dfca59e68495a534e9e6a802c2d69e/51102835342.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/83359332411.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092004441610.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/jupuragedanerapigamavapax.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/joluse.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/29153888796.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/liriw.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146481b26d09---likutuwanil.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/67539281174.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/44954650216.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/7610132432.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/18324309703.pdfIn PDF document text
    • http://goldia.cz/data/file/miketa.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/roromi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab1bbbb2---mopiwav.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/77110653738.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/salasogote.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f43385fb9e---30579851167.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/55276354206.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_off0000b059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB059 15176 bytes
SHA-256: 66cd2b5317ec582de02cf26199a817d4b7ea8cdd193a28f0f9cb6ea867441e91
font_01_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 10760 bytes
SHA-256: 986bc8149a45927c834fbbcd8990c9347218c7de38555d632ae67908cc21288f
font_02_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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