Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed59247eba79445…

MALICIOUS

PDF

76.3 KB Created: 2021-06-22 16:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 12b28b01b4749353b6037920ba87c1be SHA-1: 5d0c39b54557c8f68031f1fcddc92cd6ca22d249 SHA-256: 9ed59247eba79445fcec835cf4153491d570809f5723a39f4f0b2480ea2782c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=the+red+room+comprehension+answers PDF link annotation
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a0fbb2e13b6cee50bf7d9e8421fd07fc/pegesewom.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b347eb326b2---wedul.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/degow.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/a8m9kshn1urqptvafm74mcvkr5/45763109329.pdfIn PDF document text
    • https://latework.cz/soubory/39374787164.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7aj1vk7sku7olvpb2ggfvlesvv/43084128045.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/sezubulebefe.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/36489164364.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/zigedazol.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/83742476447.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160854fe7beb73---puvuraxujepixesimomepud.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/54156365831.pdfIn PDF document text
    • http://hydrem.ru/images/file/sebupabilajop.pdfIn PDF document text
    • http://vce34.ru/attachments/file/kofizigadagowukir.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2f6b9da78---wemurupedireduribu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160996cf1bf627---figivuvewiduzufinebukasaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 5320 bytes
SHA-256: 06c17f1e82e3c1bc532dac383adcde20ceeb17c597f5104157018b732a812938
font_01_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 10544 bytes
SHA-256: 6714e85747c9be0d0b23eeeda84985b718594203a887b2132c6757068d8188bb

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