Malicious PDF — malware analysis report

Static analysis result for SHA-256 818ec6fd6fc38374…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 20:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 797ff5e4ebbed411fa14b76150da49f1 SHA-1: 6f477b8753ebb6366f2bdd1084da4f1b5e36b692 SHA-256: 818ec6fd6fc3837438f18c47bcd7971f1e6333b0ee56a7da810b7dbde641176f
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites and disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=the+alchemist+wind+quotes PDF link annotation
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/oo5m3tmdh1189kjabftsoi3mf3/laxilisam.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/25416511849.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/bfcc3e24a0906179c143d982e6c16617/tidazexewavogixiperinedi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f8d5b86d7712236bf96e11831bf3bd5b/xeribelokidovutinafux.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/545aa647742259cea104461c89863bbd/gepepopiwade.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f040c14e49515252573aad9eac6fecdd/80896798709.pdfIn PDF document text
    • https://ekransamara.ru/files/zijagigamirosapu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-16/20210516084201971886.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/b2tjc51a6cra15q12lbd6ft3ld/17642901851.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/pefilimigufavukojameb.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/pipolawuwudixikax.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/26825342404.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/viwajum.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9a4b4ccc0c47849fec893082fda483ee/papixujimamug.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d4801031---mopuduwekulejidubasubomo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f91f374f85a3177d346189c1e468b15f/kedojofezutogez.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/18869022554.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608012ac96f81---35616200105.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8bl4n9os41f70udsp7o5mi1ce2/metixapebagatogamidi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835636b2ed0---98533775184.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/46a60951136dd1ad1aa8eb428916d914/noxaxogexiresiruv.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/3536499708.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/23380844783.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/xanekuxulakawupizobenute.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_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 17060 bytes
SHA-256: 43ff14d45328a103d4c2a03246fe57ccf94beb177596ad309190e26c4d4a4eb0
font_02_sfnt_off00013c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6D 10832 bytes
SHA-256: 3255b339fdc75cd6d696ca9b8c76712bbb3cd0396e1f6b171d28af2b6839bf68

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