Malicious PDF — malware analysis report

Static analysis result for SHA-256 302ead7da420017a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 23:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e993fbc40823fb563e449b37084838c1 SHA-1: 0e2328b166145bdaa6145e4999010ce569db73b2 SHA-256: 302ead7da420017a4d0a57ee9e05f9fcedc69c2e0e6f636d74d66f8ea1e85f7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs structured as a link farm, with several pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of external URI heuristics and the overall structure strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=basic+english+grammar+notes+pdf PDF link annotation
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614138181a6ba---butetoxiniruwutig.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xozoxilomazog.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/sibefagesa.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/vakig.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/mutewe.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/tiloxukojinek.pdfIn PDF document text
    • http://exima.kr/userData/board/file/nilizapalepolizep.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/teziwov.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c2ac8e08---wipozodezetazidomozam.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328767720fd---xolemexuxatoxitadak.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/fifawapute.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/wasaropufukoji.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/fijabuziti.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/pewanubafivi.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/34348007048.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/95148542994.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/27533689427.pdfIn PDF document text
    • https://bursac.net/userfiles/file/lopon.pdfIn PDF document text
    • https://seger.cz/userfiles/file/88426681453.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/kibimonunowowodirejozo.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/75963563501.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/36295407081.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/12948508502.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/25540795072.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_off0000ba09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA09 15476 bytes
SHA-256: e1dfc9426a062fff3d617015adeb8700b20c9fbfb348a2b1222ec5e3f9792a95
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 11120 bytes
SHA-256: 0e2a416c1ae9cb30cc1bc67a00e6d5ca8e069cab221b4b289fcbc480683eafa5
font_02_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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