Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba6089cc24ff3c5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 19:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42cc46c8e1503e452d218631483294d3 SHA-1: a3f2a7301660d1351c8e286f9f5803aa63ee7e5e SHA-256: 9ba6089cc24ff3c59d90d2f9cbf54383ea91c65f5fc1338507502851cd115d9f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to facilitate phishing attacks or distribute further malware by directing users to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/77810272d778c938a3c97d17d47d5793/sejejodixex.pdf In PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/684186287bab3b87a4b2f9b848287a2f/67474355986.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608198583f73e---mavexejuzane.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/7736738562.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ivi3ps9kh8esbq4uuieoss8pn7/belakifivedunev.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/nilozulasu.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/silinuvowimanesi.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/26670741427.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/bafadanunu.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/vonanufukujetijoguzitome.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a49331107a6d531001267c88a00b5840/23996474850.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa258d97862---66829908237.pdfIn PDF document text
    • http://mosjob.ru/images/file/gukad.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/duximetalapepiwo.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5030b8f37d4106d522fb80794781a1ea/25886955107.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/16840319095.pdfIn PDF document text
    • http://yuha.be/_files/file/pevaweguro.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0bc0dc839bea47faf748e67ace2a9a8f/1456958153.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56699e9075---34915003996.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/njif3dtpvrdqtmevslff5un7ks/67780876533.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/solotemipoxozaribi.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210528_92B3C4B9C60351D2.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a1c90d95---sokaxifobisodugojunaxewup.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1p21e9vriq03p8rdvtd87snsf5/78125126426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=middle+class+family+homePDF 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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 20072 bytes
SHA-256: 5783df08e84b682763840c867fca930623f422727bbd716758b7cfddb25420e0
font_02_sfnt_off000134f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 10544 bytes
SHA-256: ce8c4dc0fa4ffff27f9510f1aa5c8725eb4efc836c2e789d09aa9b4dab0599c9