Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e0a1022f84aadf…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 00:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cefe52231d8df90cf87fa43db079f6e6 SHA-1: d3ed6dc6ebef4b5d64b2205fcba4d7973d1375c3 SHA-256: 96e0a1022f84aadf92b9a2de4c5cd9b1ee21630905ded371bac6f0b2036fae81
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sushiloverca.com/uploads/files/62978185873.pdf In PDF document text
    • https://marblobaths.com/app/webroot/img/files/30789397212.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/gutatem.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/20745077396.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/67262489703.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/tarazudosuvoti.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f0c5358dc3096bcd8e34862b3733056d/95483981887.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/fedawo.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/1716932989.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/xafetigujebaxodaraletaf.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145af6d060e4---78153659981.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/19380426491.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5d77eb06---27521839197.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/zavasujomaworiv.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/24067440441.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c845bd6c1---sumalopobomakoligunif.pdfIn PDF document text
    • https://rjpexport.com/files/51901699418.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/gibiredupumapamuwaxid.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/texazekusivanapa.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/fikekunu.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/vajonipevixopomodusikiku.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/lovubu.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/mupulepeb.pdfIn PDF document text
    • http://bdsductri.com/upload/files/51615635214.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8bda749a---jegeroxaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=practical+machine+learning+and+image+processing+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_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 11068 bytes
SHA-256: 84734226b215b9419baa178ecc1e2b9a0596abd214a6214bb415ee2becf0b0cd
font_02_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 17420 bytes
SHA-256: 575ae8f4a7960a72c913123ea39a9e1982a05f976993fa6ab0de7402427ff57b