Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0bf7ff0c6ecb80…

MALICIOUS

PDF

69.4 KB Created: 2021-09-06 12:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c6b81dc7ef5dd0878fbe257df2050d9 SHA-1: bffc15b8c7805dfe0fa5edba4783a74ca4aedcf9 SHA-256: ce0bf7ff0c6ecb80a74312ebad788d4ced906c89c4f143245468be3fa4169db3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, suggesting it's designed to lead users to malicious content. The presence of multiple links on potentially compromised sites points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/0675fae3fad879dbd01b9ac250e5ea2e/mijinexozukidaxova.pdf In PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/65uf9mesg57nrpaorp6kl5fq3j/22729268729.pdfIn PDF document text
    • http://debten.net/UserFiles/File/toneremabomasevaf.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b261290f2b6---rinumupa.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/32142709872.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076de8a44206---liwosuxakevefi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06465b1c16---dukuviramugogabo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/81043653884.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/61246614144.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f3db127e6---minamamoxudimapuz.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/rapoxukevofu.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/63497202496.pdfIn PDF document text
    • http://aps-mes.com/files/file/85726895689.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/pazaru.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/cscso5guqsmbn1s4k5980jc8as/xosabegaf.pdfIn PDF document text
    • http://prestopc.it/upload/file/30985754373.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/tisagubebadexofu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc082ce1d---18887105020.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/78159765919.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcefca028e---85474652585.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8abfeb4d35dee0366b329cae6e986a74/kuruzofimutupamokawaxura.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f6dadcf3916d8163de12145d6409327f/50768229452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=google+form+into+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF25 10548 bytes
SHA-256: 134b9171db2adb2e4c28810ff283606b12e155b5989fe5a2f00512be0ba43d6e
font_01_sfnt_off0000c6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EA 16200 bytes
SHA-256: c364729b6a01a45cfc357f9a41b447bbce04f93bcf266cc1996d6b469533fabd
font_02_sfnt_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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