Malicious PDF — malware analysis report

Static analysis result for SHA-256 5530bd291c0a4366…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 02:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ab0e467324cca7a82e27f03c69ed1584 SHA-1: 5b3817b4bbee5b9651966e71a06326567a62e0e6 SHA-256: 5530bd291c0a4366d2fbbd96229e29b9671d5bf75ac5892ebcb3ccd5bf84809d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=antutu+xiaomi+poco+x3+nfc PDF link annotation
    • https://jamisonfurnace.ca/userfiles/files/tajewe.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/49374614492.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/79806417212.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/pusesepusudodolozirezoxa.pdfIn PDF document text
    • http://synfarm.com/upload/files/44678212178.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/fafomat.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/16002777246.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/fomawalesib.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8f3f599c6---muduviwujijebofiteda.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/vewanumifijesamumelupo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141914b1086e---fejogagol.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/50643977841.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/laxexu.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109182253414581.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/86671325256.pdfIn PDF document text
    • http://lblussana.it/images/file/94534998164.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/mobojonelukapukuvolowu.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/87207715974.pdfIn PDF document text
    • https://tuinvandecruys.be/file/sivafiw.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/18994043587.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e29a3e0535a0c6ef141c889c1df10b1d/54771989212.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/kubilusovusesepes.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/45923111892.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/28549242886.pdfIn PDF document text
    • 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_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 10548 bytes
SHA-256: 28812f52a45d2fe95405e3b2da8d342480ddace9ccc7c10dd9c5ea25564350b4
font_02_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 19500 bytes
SHA-256: baa2aeaf2944891331b70c946e753996efe3fc6e5846444376cd2cb2a8d5deac