Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbca584ea003aaf…

MALICIOUS

PDF

102.9 KB Created: 2021-07-01 13:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f84b498a00add9a822be7f1820ddf73 SHA-1: b0bd0f5a8cf83042ba431410964db15bdf017b6f SHA-256: dbbca584ea003aaf187e4a982023eb74b58c6f43ef89129e4b7553a510163455
176 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/3au4cavhct328341n8acolfnm7/42301807828.pdf In PDF document text
    • http://whuntex.ru/userfiles/file/99523931130.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/sqrnpo5ob5iiaq4qgu3dvpgt34/59276917642.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i3krs2mjh7kk0qjbf6pspv47kc/48068887476.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/24188214262.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/lowolanomifuvaxod.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5eb0556ff---75722815842.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/nukenimunilutowoposomiv.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/bce75ad4e2b9e23a1a152c1582952c7a/bosujakuguvipeloxega.pdfIn PDF document text
    • http://ibb-online.ru/f/file/87609021277.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9b30d5f7---63977969641.pdfPDF link annotation
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f8de25e2fdb4ad11f224f757dc2930f8/62640450390.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/98b95906364f15547dfda5d9be676def/27349744479.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/votugupis.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/92971774552.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/xalisowaziw.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/sexigipolowubufazexijepil.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607858ce5d213---wakoxu.pdfIn PDF document text
    • http://sns.hu/_user/file/80159055699.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f4130d8e---60036880930.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/acda59b4f34329ddcbbe07ad5ab58c10/36540988044.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/74878883462.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/bakobes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=iconic+opm+songsPDF 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_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 17572 bytes
SHA-256: 74d20588838573409ec7e28838b948620176cf925e7f05d77e48178190e76f5e
font_01_sfnt_off00015e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9B 10128 bytes
SHA-256: fee48a9f57f156207d8562ffd1f5d891e262de41fbe3f642111f55235b4edf5f
font_02_sfnt_off0001752a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1752A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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