Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4db7583fbf88eaa…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 09:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 979125a4296c59628d17c10c9a85487c SHA-1: 68b4dcb123bb0a06df86ee67e9bf5e8f5d4b5a20 SHA-256: f4db7583fbf88eaa6dcc5c420817bb687c1cdc9434631e64a581565106dcf389
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=canyon+defense+for+android PDF link annotation
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/16365171330.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/445b5ee270da88044471731d5306ff93/vamusototimijikeli.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/25428983679.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/28784603195.pdfIn PDF document text
    • http://ymmicro.com/files/files/92592389149.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/munikejunewabudefikax.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/palunugujezagipudumedem.pdfIn PDF document text
    • http://bastola.org/userfiles/file/41914136481.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/gidolatikus.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614068e227422---begelegifi.pdfIn PDF document text
    • http://17njl.com/userfiles/files/xadodudivazivefeduboke.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148994e25092---87622467241.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/kojebuvuwuru.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416aa6062e3---56045710455.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/zegepilonajevasanid.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/kujovatiruruvumi.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jolediwevobofarabuk.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/lakosujivewawekef.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/55854970660.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/34235688093.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/42602407795.pdfIn PDF document text
    • http://flexa.cz/docs/file/4901454195.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/marugegogasisokugefiwetu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fef6d2d64a---11275784714.pdfIn PDF document text
    • http://fluorescent-training.com/file/bofuvatafotufajokek.pdfIn PDF document text
    • http://adice-area.com/pictures/files/rufonaxoxebowoni.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_off0000b3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 10348 bytes
SHA-256: 51d78be2749279d7f37f7688c6f20ecb72d6553c52a794a76cb311861c104562
font_02_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 18688 bytes
SHA-256: cb103ba7514ef8f5cc79e262031355231fac47e3196afe67a8b1942f49604fca

Open this report in the interactive analyzer, or submit your own file for analysis.