Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ea120ca280edfe…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 15:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0253ebb5317927687d9d783b9ae56dfe SHA-1: 983e42f1f96bd73864be08d30065e0425a0b5c7d SHA-256: 90ea120ca280edfe958c3045db0760b63393dfb3425e66352072941696c6377f
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 websites or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://willowslakerhea.org/userimages/paxevomumavamebekuvotosi.pdf In PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/pasufaridigabi.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/1104894135.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/86143598959.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ae53ff58---688368334.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/58133714105.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/19909310526.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/vabugakorel.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/77052065719.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/gixesejedefe.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/020bcb3aa32089c706d9980b64697f40/dowixusafedizudoreme.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/likusizolokurapisarifuju.pdfIn PDF document text
    • https://jobtiara.com/files/files/mibakuzunaxulowogunadad.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/68413426955.pdfIn PDF document text
    • https://tele-video.ru/upload/files/gowegofarodabonog.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/regiw.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zumiluvurivapinipupa.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/dojopenuzagivolezawexuxi.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/kinamesane.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/xesusapinijosebanu.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/nusinabitojajap.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/dokedobigeditew.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/48979444112.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2bcde00cd20d1df81ecee865dbd55481/xibitibakoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wren+n+martin+grammar+book+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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 17708 bytes
SHA-256: 511690050bcb998c50d537b2f7dc5b5e9c1e9991eea5b08d2319a70bbaa1db8b
font_01_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 10852 bytes
SHA-256: 7ee9bce941430c1b335aa94f43d5fb1a8a464a7454fd775f26c96b257a86f08e
font_02_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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