Malicious PDF — malware analysis report

Static analysis result for SHA-256 94828c47832912ef…

MALICIOUS

PDF

97.8 KB Created: 2021-09-03 02:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb9811b523c12dd0228ecf27a7ba429c SHA-1: d91e7c1205f37b0235c93006470663217de3d97f SHA-256: 94828c47832912efd116aab47af9aff7c50876f8e98dfa8054d3ae3265949ac3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://birnagarcollege.in/userfiles/file/53838836671.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e609da8a28a---12471516083.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/kisusi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u2kn1gslh6h4io6ucvu03ujmut/13673780603.pdfIn PDF document text
    • http://ttc-investco.com/img/files/56905074928.pdfIn PDF document text
    • http://cichanski.com/Upload/file/1528076265.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074538086975---nubevipovesoxaxowe.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/1642549678.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3d5195e81.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/titudonugigorugefuvawoxoz.pdfIn PDF document text
    • https://stauber.lt/images/files/dakebenomonaviruxote.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/vilugekonumefigef.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/91108546681.pdfIn PDF document text
    • https://tomas-music.com/contents/files/jovevimedopogir.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/69461134324.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4470d879d---rubatalub.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/44287957533.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210813_000215_1060.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1fc34263c---8145214445.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/zirutubobiv.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/438c40b4fb0232315476e4c53f013c99/zirurezezuwevewupideloxef.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043464d1d07---pogofomekuzisef.pdfIn PDF document text
    • http://scro.ru/pic/file/1784789149.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/baribijuvesaxog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=livro+augusto+dos+anjos+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_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 10748 bytes
SHA-256: b63f569e32ad701b0461c93d5c686f72e67ca2ef78d6dccb95cb77b087e48693
font_01_sfnt_off00012804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 22180 bytes
SHA-256: d73e0d3a501116138ddd10d021714b195e96c26433fc9e9d52a23bbb5795ca13
font_02_sfnt_off00015fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1