Malicious PDF — malware analysis report

Static analysis result for SHA-256 87af9810bc96a459…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 00:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 480cedfdabd601c6ae43b0fb8370721a SHA-1: 012dd77a07d884c364a0fcf51c734b234d861b0f SHA-256: 87af9810bc96a45969b1a4fb1d58f57075fafe4c9f1a43f7c2e3d056c3d81996
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution intent, likely leveraging these links to redirect unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://drafthe.ru/uplcv?utm_term=talking+tom+sky+run+play+store PDF link annotation
    • https://woft-dining.com/webroot/editor-uploads/files/21811001590.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce963eb04d---46258827312.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/77194275391.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/wofekuzodupawetivubobuwed.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/94884669837.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/70769343752.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/namozejetisav.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/66028663862.pdfIn PDF document text
    • https://red-adlay.com/upload/files/mesarigekixabasupibute.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ml82l7b71e11v2lcvmlrn899nk/vesodogiwebixuwulodugo.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/9623897308.pdfIn PDF document text
    • http://tid.vn/upload/files/jegabi.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/gopaxukopaferogipi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144b2d85620a---demajegogike.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/32917349337.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/46819619922.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0ace8ac7---rosiso.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/sakukosilig.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1321019403614e42b2cac80.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/33863932998.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/67974558020.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/96141714972.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/xeluwer.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/mikukoke.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/41251935037.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_off0000b2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 17964 bytes
SHA-256: 9d60b72477b3f0c99e581d05f12906ab7ce12deef1bcee7206eac63d6e39e301
font_01_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 10864 bytes
SHA-256: 03e80d5e14a44d6bb995ac931c8fadfaf437cac8510acec61a9c524ae7b239aa

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