Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5fbc86392fbd4a…

MALICIOUS

PDF

87.0 KB Created: 2021-07-22 19:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5636af14c6adaa04fd4e5dad5bac1b6 SHA-1: 9ad79a1f4b33ae8b04f3f2743aafc24b79f563b5 SHA-256: cf5fbc86392fbd4a658a8993e3360286a42573e8bfafc21c730d560881210d50
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware distribution, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://douzonebnf.com/upload/file///nebuzo.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609034d4b4a14---54384134021.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/99341706856.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/58456478233.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/f23p8f3qqdmv8e3uf30ijpireu/11416795294.pdfIn PDF document text
    • https://ahha.az/userfiles/file/58705761484.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/57e619ecc7dbceddfe6b87e033d66a62/36858177805.pdfIn PDF document text
    • http://skisun.it/userfiles/files/dulumelatovujonabuvagixok.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7d75aeb6ea90a4696a2fff0b858f328b/16510381304.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1d5d2d08bd11f2d461021ef503d6bbf7/84086163325.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3f74242c6---zisexifegixibiwol.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccba378787---82376514675.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/31089378596.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/54291285500.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/ritasijisevomuberuminu.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/62dd822f4eae6aea18f97c027870148b/96449332361.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/27558517612.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b9b9556ed17a9dac842110649d8decaf/31863177479.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/ffdfd4a3b96d6914d4b333c969c76bd7/xivunazowopumadowotujum.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/lanafefisefujadofis.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d7308a23---4347215630.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kg7kjq6r2jtvs783i2u8spo339/67038454704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=102+kb+to+mbPDF 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_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 18464 bytes
SHA-256: 34548bb9455e20045eed01f12e6f787ca9df3bc4cc9daab9c5bcf1dfb7f44971
font_02_sfnt_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 9896 bytes
SHA-256: 69530f305b3431542627e3d4069a71b97a43b29abe6ca9d9db29620f4c360c9f

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