Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f898a9d4b0fa15c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 04:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7781bb6a8caca87c85428e35c07411e SHA-1: eaf76559676a9d40734a88e006b7182a53d70214 SHA-256: 7f898a9d4b0fa15c095698be8df16a0fc2294cff98a7b1fa9e9ea68d2f0ff068
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://bindashnews.com/userfiles/file/24369101475.pdf In PDF document text
    • https://suksesunited.com/contents/files/kodawerud.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4db5cccde447f49fc543db3f1e753b63/24432615580.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/20005399561.pdfIn PDF document text
    • http://plncse.hu/php_data/file/49814275475.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/zuvokokasunuga.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/2393324897.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bodadazidugitun.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/zelakiva.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/wokevazolov.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/95591209854.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/8db1a39bf178a6fb9de3f9002de0d409/xinefibug.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/fululusifurus.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/65213990168.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/22979124967.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/fekirebidunexogifanepifob.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e041416c---tivefagesoj.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c89eac1a4bc---balikaxumifuge.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca64580540---58780912276.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/fewimenezolimex.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13bcf45d13---79547693852.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/13821272925.pdfIn PDF document text
    • http://carszana.com/image/upload/File/gilojomu.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/kiwagawawof.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/tup40lcumi4e0mufkrlttdmuj5/28444633209.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071290b83f97---10694923958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manchester+to+azoresPDF 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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 19372 bytes
SHA-256: 05341c50ec0a06026b5ef385fbc13edde619f5f4fc29cedc519c7d6e20ed0c73
font_01_sfnt_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 10240 bytes
SHA-256: bde6c49c9e9fa2cae7d174c33a1b960f6312e2a07273758d3767aa75ac39a0e5
font_02_sfnt_off00012bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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