Malicious PDF — malware analysis report

Static analysis result for SHA-256 931a2f2fb97d2c5d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 02:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b014caae46893fd36d40e353e6d7c20 SHA-1: 77073162b7e76938a5289fa627d9ba4cd71db3cf SHA-256: 931a2f2fb97d2c5da54569763f64b59b15a381d6fdae12fbd5fc905188a08bcd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is a common tactic for directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa5d05166---32955433787.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a735b43cf83---xikek.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea611efe9f---sujobelatowufejedaz.pdfIn PDF document text
    • https://soechi.com/userfiles/file/sugixevedawawikamosusokez.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/uk0l21hfm8er3vhpbqo3h6hsrm/losoneguxobiton.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kegipux.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0eae73ba---vigusuzebogivo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/468a7ca90216a0313ccd3f482208cd2c/tijavimifexeliduzofeba.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1926c59ef---lobevifemerutesivusil.pdfIn PDF document text
    • http://aven.su/userfiles/file/65318280915.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/vaxotokinosuzababere.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d91c3554bdd86fcfaec7a4eccf191518/nupiribotog.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/58174559647.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/jinunepejop.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/bejiz.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/732d81c8d6401f3c8f73057fcdd15bd4/numaruwubukigizupab.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d2643c72c2914a433c13ca988b08f2f4/77661285028.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/73957779935.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb84f7b9993---3718783975.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/84369169494.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/3040794850.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/lafiresanuwekugunilixupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=linux+resize+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 20944 bytes
SHA-256: 22c91ebd28e4525892d0edb4b01e8ad1a6babd372eac542088f31b37791fc9b1
font_01_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 10284 bytes
SHA-256: f1a67994bfa82a4d2a2715e6d3892861f17beefb294d1c4a741b67b359d3393b

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