Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f149b5019ee3b04…

MALICIOUS

PDF

79.3 KB Created: 2021-07-06 17:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 67649e2a69c2ddfd1822a99d42166191 SHA-1: f0e91acf6cbba8d629b8dc599dd4b19b50669f91 SHA-256: 5f149b5019ee3b04c9e43c7205c093c5805831aeb8b8a4c6a3092d43da72524c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://infrive.ru/uplcv?utm_term=how+to+search+for+a+word+on+pdf PDF link annotation
    • http://analogsys.com/uploaded/file/1332423829608bc2f368fc5.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0185e2d20---duxumafu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lonokowojakef.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052205084910.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pi8b7u15a92851kk8qs6vb0nut/jekenedepir.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/wedibugezaxubagetima.pdfIn PDF document text
    • https://rintrans.com/files/28166568702.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dedd81e40b---23648408198.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/15222648301.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a659789cf29---32651607360.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2de18c3df5---61896621862.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608126a2f2b94---rizex.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3a36ec2ee---62973913868.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e41f8e92f0---xidawezopokipilaxobol.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abe17582441---62408839138.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a62b4f77cce---94367139553.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/h1d7b972itk0tgtk58197sv9eg/zajunikexutapu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5d16m38ga865g8hsrt4fe1bdup/26308113330.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/47153271750.pdfIn PDF document text
    • https://andana.us/files/files/levizekidutebulepijav.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/doxulutaxigexurofanu.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/6897418909.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/rinag.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_off0000d1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BF 10656 bytes
SHA-256: 0085ceb712d80f97afbc1122842c1ccf70d3a7e43b369e928155ac907576fc52
font_01_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 16984 bytes
SHA-256: b9fbcbd3cd6452ae284a2e71979b7a8f41baf5c45d575893cdfc93b9d85485da

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