Malicious PDF — malware analysis report

Static analysis result for SHA-256 2576e352aad3d8f0…

MALICIOUS

PDF

111.1 KB Created: 2021-07-22 02:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 46e999e729ea99cd1cc9dec1829ef9e7 SHA-1: 47e0037d612dda847e7723cf99f88fa63543f52d SHA-256: 2576e352aad3d8f064d39135b29293c2a9dcf25f88ded1e84596d4c3d1a96e10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links that point to various websites, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a447cbbd85e---ruxujetegube.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/13649064123.pdfIn PDF document text
    • http://sun-tes.ru/files/file/sajudokoforizitene.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609821b6729c9---72677367781.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/75689794184.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/14928093120.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/mozumifesujojufin.pdfIn PDF document text
    • http://garderoba.sk/images/_file/jenamokexupiw.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/pikutojoxofexokimuwatoj.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/tewevep.pdfIn PDF document text
    • https://primer-spb.ru/files/files/19677928438.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4786aee245---zajabizuxobusajokanotope.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/07d1a77983947c66a38a996d841f43d3/26318867716.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/87fac52fc79577694220dd31d0879122/kutolixoruxosufetun.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/44028031846.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3472fe27f5f9c44dd5b65a575cfa8f23/zisaxisirorabonumozurig.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nirajiku.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/gulug.pdfIn PDF document text
    • http://remobudostol.pl/pliki/61611374898.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/91212413797.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608483a20ac26---88459171106.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/69856049564.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/93917377555.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/viguwumowugi.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/kezawemonezinudisalizari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fungal+diseases+of+poultry+pdfPDF 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_off00015025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15025 17040 bytes
SHA-256: fa50dbfa05c15c41fd07222e98109bde18f539448b5ce45ce8793cb446fcd497
font_01_sfnt_off00017c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000194a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194A8 10864 bytes
SHA-256: 970172ed2e2b3d66bf9c57581c26bf3caf5d4a64e3de0bff0f25d50855f61ff0

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