Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17988edd3829ab4…

MALICIOUS

PDF

87.6 KB Created: 2021-09-21 18:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7e04b508cadb991d486386bb229bb29 SHA-1: 3000ab279e3a33478aeb3324288f15847a36231f SHA-256: b17988edd3829ab49de4c3397fb3f91ca23c382850ac0aa1e4e9beb1c22fed34
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://baruipur.org/ckfinder/userfiles/files/69520645811.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a7a13706ed1d6e97b1ff7ccbfd9ef52e/lemexazitajuritofukuk.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/patulo.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/remegora.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/20628344560.pdfIn PDF document text
    • http://poultech.net/d/files/55032597863.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/loniwurasegagenovejotipi.pdfIn PDF document text
    • http://duef.ru/public/file/xusipifizoz.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/29630068258.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/22735976901.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/tugamodutijumamu.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/xofirarular.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/zadikixesipemofagozexijub.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0d14017bc92a22d99497be64e251a647/xamimido.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/tilifa.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/46588549379.pdfIn PDF document text
    • http://446888.top/userfiles/file/xinuzumibaf.pdfIn PDF document text
    • https://denimder.org/resimler/files/nuzojugisegakakopedube.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/burizuxaganesam.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/18841810315.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b372603ca4---64923862154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=australorp+chickens+for+sale+adelaidePDF 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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 10888 bytes
SHA-256: c90855e2b5b4d0f3b9b1b272a2d2b9acce6a2fdbb8b54155c97e26c3218a4844
font_01_sfnt_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 18460 bytes
SHA-256: f4be24bd9c823d12c48fd614c4a77a75a13617f42e5587a8bb13c65a78ed180e
font_02_sfnt_off000138d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1