Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82e6a10bf1ddab8…

MALICIOUS

PDF

71.2 KB Created: 2021-09-13 06:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c6900e80948d3df7a4cb5159933a4604 SHA-1: 410fc8f918b6931630403e7f066af62eca523908 SHA-256: b82e6a10bf1ddab82b13b9d7255e8aa89d6e56dc3dc831440b5b8389b8f2cdd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://amicissiapiemonteisa.it/userfiles/files/15943082449.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/2021991732374426.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/zoxexoxibopezebis.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/jalabebesadoveguwuv.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912175532319619.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/22774137694.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ec11b930---vufifagafamejukonipijix.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/xisudato.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf44471e4---davitejuni.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c3b4d66670cf1747d34c6231fb9b68ee/dazuvesulokibi.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/movujixanafurekamivuwipil.pdfIn PDF document text
    • https://tomas-music.com/contents/files/8927227232.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/watiwiz.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/soxapoxuvazurikig.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/dumutefobajajineta.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/17891058188.pdfIn PDF document text
    • https://limadelimon.com/images/file/xakukuzizesupiponutixoxa.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/duxikukebozetato.pdfIn PDF document text
    • https://taperagi.com/contents/files/93287160169.pdfIn PDF document text
    • https://yifff.se/userfiles/file/rapezuzirusonuledinaxug.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/64254482782.pdfIn PDF document text
    • http://asja.ua/userfiles/file/wojamewawokar.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/roruvijajigini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dress+up+diary+gamePDF 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_off0000b512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB512 16488 bytes
SHA-256: b34fd1881ca731a74ce026fdbb1e08d0b61ae3b7f8942e7ddf98c21aa49afd95
font_01_sfnt_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 10584 bytes
SHA-256: c5d45d224b568d1b0247da22da924d7208f26c25ad35245afefe93af4a7d1c83
font_02_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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