Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3a92378bbf5481…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 00:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9cc38ece897e78b1e7ee45d82a17590 SHA-1: 76c12b310c7264853cb92a0b21de8ca82ea24939 SHA-256: af3a92378bbf5481995da9a597ec9eee692fabf344903c061f5514071d36ba98
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://aarogyamedico.com/userfiles/file/33838330387.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe555e97f---43518062560.pdfIn PDF document text
    • https://shopabrang.com/images/files/59426041626.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c3ad4c6ae7f2e807a3183ddf1b78ca84/96508349431.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/vomenefazojuzodepize.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/megogoj.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/sefofexu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9c04bf8946f95fbcbfdfb2567db0dffc/nilaxununugonupexuto.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3c99463d3---43979296976.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/zugililibiporebe.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/37622336919.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/matoruvirazol.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-19/20210519002645405820.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fa34dfb8b6c13257ece16225a10b81f5/ritibaxar.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4eeb12f7d---kevexuwidaliwinuk.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/66215857511.pdfIn PDF document text
    • http://identik.hu/editor_up/tasigaloxamuxufu.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/xiwupegewapakizukukug.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/24746539844.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/63665521630.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/12138923737.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a975e5cf6d1---jaremogutikiku.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a406cb8a55f---82511485919.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/wujepekimasakobe.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/34542922439.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c166a37bf---fujejibubumamal.pdfIn PDF document text
    • http://robbes.nl/media/files/gujafaxizowubovuneveja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=architecture+competition+annual+2015+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_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 17220 bytes
SHA-256: 1c88e23f4e07e844859e6aba711a390ebf0dab1b7752415010e5f1450b8f5913
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 11228 bytes
SHA-256: 7fa6b7856fcbb85b0f0cc77b92d9cc1a581398ced360953861d36a0bcf52055c
font_02_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1