Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0185840d4a15bc…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 23:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51811cc26dafb64e79ee975b01173069 SHA-1: 2336e51f0a94e66933ebddf64ad945a89edadc0e SHA-256: 6d0185840d4a15bc13735fb29a56b64edbf0fcd6e6c5df611a4636e1ed550cc2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm, with many distinct hosts and UTM parameters, is a common tactic for SEO poisoning and directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=disloyal+meaning+in+marathi PDF link annotation
    • http://luckdidea.com/ckfinder/images_store/files/girim.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/xotopixaluru.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077740f0e0d0---nozadaz.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/3743d78fb4adc3407a9619986db4b477/47255743280.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/nalodefokalatajazopigijex.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3a66a08a---83547272988.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/949c1d690a442e63f504086f4e9da2b2/dixowonamuwabanepenopu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hvd0c5pu03q6mk9qlo7fsg4ho6/datupikupaterotukekarovug.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/migel.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jixedobike.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/32673852243.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/59479038228.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8034f655---vixax.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/d7f35b040440ea043887f343090ec0aa/39460316995.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/57199836375.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r0d2116g9da55lpq2alcirhcr3/81922842126.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/40206678983.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/58985962038.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/169f20bfc1b27ca42bfd154cd55cc571/lizebixewedazoxavaninuv.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/lemedazofofumiwofunonudev.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/4413675897.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/3698506206091df897a147.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/gelisapetubasa.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_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10672 bytes
SHA-256: 53ea26100edb28d45f6ff66aab2b554e01b59a8d8f326a808d512ea51e678ba9
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 21640 bytes
SHA-256: 6b8588d47478e7519792cf250b1a5ba711831570139a21ff82634b073461d763
font_02_sfnt_off00014070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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