Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a50af2510f9eff7…

MALICIOUS

PDF

83.3 KB Created: 2021-10-12 02:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 78268d4d5405ee6210eb4d4caacb4aef SHA-1: 42c938d77a708209d0fe1d39a6d85957fb3fb44f SHA-256: 6a50af2510f9eff70e6acae6eb0ee531b8d22369232bbc3061847d56c9b50c60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites. These links form a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/76087258ffc2dd4a9662847a85479c78/duwilujeve.pdf In PDF document text
    • http://harasim.cz/uploaded/files/vakepubololewala.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/jsrrmabql2ds5i68ou9ok13o3s/26863128075.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/7757114843.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/54989298992.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/30668711560.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/fonavedusirakadipapexu.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/lupogewumel.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2cdbae3c8ac34b7c8d16f9403b598eef/2903925358.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/tiralijixunibuxozujajomej.pdfIn PDF document text
    • https://avela.md/userfiles/file/89948207444.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/47076364268.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/81efb4c4spuuhglmg6bl9bpsr7/91053732805.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/30187205030.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/29171357723.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/nivivoresogijes.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/sapeduwesirojegod.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/varibilapiri.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vj5a500j829u80fq9612cf8qj1/nosirazon.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161584b94c7bb1---58880425989.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/patepisaziw.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=left+chest+and+left+back+painPDF 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_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 10684 bytes
SHA-256: 345b47e14b9b60190c20706e1f646bf8f1fd17029903f20f1cb250f08a9f9050
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 18084 bytes
SHA-256: a3b2e77d448ac5bdf3023ae9bbd48f5fc13fbe735edd1027e778cf62f045d7fd

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