Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b1dd173a6a3030…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 03:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e5c37e65d323ce18e7401fd7995067ad SHA-1: b6b118e94c9b3edc3b092aa5e13f0ac37672ebff SHA-256: 29b1dd173a6a3030070195b59f35d21f86354f0a45f2a7a69f4a313251b94adf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Analysis reveals it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. These links are likely intended to lure users to malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=inazuma+eleven+go+mod+apk PDF link annotation
    • http://baraanduliaptti.org/userfiles/file/sofoz.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/36157074482.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/rujuvugawizunup.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/wadizebeja.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/32875757633.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/88072679345.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/22965941582.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/gamamujejanazotunitisiwo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0915c9d5---nexenoje.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/gugidinoratodowonow.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/86253933660.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5277e1728c8f9e1f61b2cb3e83d81157/66136293454.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/28089585331.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/sitifawazibuxavuxafe.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/semeji.pdfIn PDF document text
    • https://sergiomauri.com/images/file/78486486183.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/32969041888.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/2212705894.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/97819245528.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210917065051.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/nusipak.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/jugozopigobupukal.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/812839e35caa6b7807ea5db84f0ed739/revowufawej.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/toburesemizebitonika.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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 21004 bytes
SHA-256: d0fe27d8c4cca03d39e100116989a15ba7f784476f86e77fe809faf7a043a6c9
font_01_sfnt_off0001144e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 10548 bytes
SHA-256: a8351dcabc4b22fc564e18cdba7fa3c7e1b844408ae2b98bc80652e50af634a9