Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cfe748769a9e0a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 02:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f856e64ca8a7759a1efc7c5b927bf1d8 SHA-1: 9c4ccfd15d640f565969d7108b0a39a687d7687a SHA-256: a1cfe748769a9e0ae18f562bba8467a6c71f5ef8988d740693350a999506414a
196 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which point to compromised CMS uploads or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving further malware. The PDF structure and link farm behavior suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://a2designbg.com/userfiles/file/zitorebevofixozosiw.pdf In PDF document text
    • http://gapoom.com/upload/fckeditor/file/zorux.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607b589bddc0d---xotunet.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8154c3c8a---82578916989.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/egdjljiqqkrm1iquig4vf92lm3/22101178628.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/basoruxujigimabupane.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/16071210655.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/70830084064.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/9460954279.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/sagiwegowuxevu.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/relofe.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da0f2b1cd7c---18361691305.pdfIn PDF document text
    • http://mamitobe.ru/files/file/malokirukamozerogorexinef.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/juniradinizad.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/23323578782.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/kedodusepavetuxobir.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/zafifufitinuzagiliduga.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b663f333---57646639233.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/5377367509.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/24847332575.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4a74286b---sufewapasesinufemikanewis.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/35217594002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=projectile+motion+problems+worksheet+docPDF 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_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 11068 bytes
SHA-256: f1b5a72b58c9379ea1853cb83a4d5733cff7bf1a0180e772fb0c548c02e834d5
font_01_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 16276 bytes
SHA-256: 74b5ff6b6839a0e61c49a0835c22464a3996b788589d452af5edcc722c2df1e5
font_02_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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