Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5960c815413bec…

MALICIOUS

PDF

95.0 KB Created: 2021-08-14 00:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69dd3df181fe918b822d1eee5ed43ef7 SHA-1: 80d6aa7cc55dc9f0b160133f2cddf34bb10e6374 SHA-256: 8d5960c815413becc0ca84529b1c3439d6f67b4da037e383c142dc1f6714df2c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress installations and disposable domains, indicating a link farm designed to lure users to potentially malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary attack pattern involves directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=wedding+venues+in+las+vegas+nevada PDF link annotation
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e3a25321ddec05ef6ffc22f16afcf32a/fawolulowojefiwitalisofe.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/bujotusadinuzuxinu.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7t6mlpqjbfbv6eq48at574gs3v/lapedofuxo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a64b3996f---23200214237.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/mumavivukazipedafadu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1207d6f9---97984016654.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611205dd65b17---pinebetisige.pdfIn PDF document text
    • https://oferta.lt/i/File/ritedexapavibidevivuta.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/janigerikuxug.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/23927843071.pdfIn PDF document text
    • https://andhimazhai.com/images/files/16556246415.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad802bdca---wuxibuminawazodibapapit.pdfIn PDF document text
    • https://baptistfriends.org/media/57996660373.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2e5aa074---gewego.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5d031bbbace7e33dc0cb8c6b7e405d7a/87769318199.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6ef46f33e82b14611c44d76ac6a8998a/similinuwoxup.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/dfd989e6f7919190583aa06a2ed6f6d8/39206363026.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/faxobuku.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/42134747122.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/jeduwedurulut.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/65179176026.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/93019574733.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc7c143e4---56205209582.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_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 18068 bytes
SHA-256: c76b25273f31f7774f8fa2f948afb042653b55fa1dd59d994b68fde7c08fa4d8
font_01_sfnt_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 10264 bytes
SHA-256: 0195b654ebb6a91308b635128bbe3956f3fd031784d3c21f5859110f3eafda7f
font_02_sfnt_off0001551b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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