Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef1a8adc5b866bc…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 18:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcf48bb13e302269dfc50bf6abeda9d8 SHA-1: c0dc06830be0a3625c416f3ab1c206b5b25da042 SHA-256: 7ef1a8adc5b866bc20f8415c35f7ecc46c438afafa5e48299f3715fd2b147a8f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest the intent is to lure users to malicious sites, likely for phishing or further malware delivery.

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://zonwering-belgie.nl/ckfinder/userfiles/files/baxedasegawinoboveripij.pdf In PDF document text
    • https://delcinfo.ru/img/files/files/gudubi.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/18312971059.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/rilos.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/36210079187.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/vonulavum.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/77229181266.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/20fc748af75da1ac0bec3cac9abe22bc/74347918911.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/15022163245.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/37214282078.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1a1e835c---paxuvivonejikuxexefa.pdfIn PDF document text
    • https://semut73.com/contents//files/xikagiki.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a31b0750889d81a1afde958e3cf6b9fd/jemefitekanomazokulujepu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35794002d1---jenex.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8796b9ab120ed201eea93e3c42260bcc/2912919667.pdfIn PDF document text
    • https://myhoteltrip.com/userfiles/file/tudar.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee48b698bcd---bilef.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aabadac2e---18727756024.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/52746569372.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f164582ef5---tepofatinanapefupakujito.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/653052710.pdfIn PDF document text
    • http://kotolantopeni.cz/file/37184087500.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/daxuxe.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/fumof.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/82788622604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=internetworking+with+tcp%2Fip+vol+1+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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 10848 bytes
SHA-256: d337907d1fcaccf374a339b03c6f55c9cb93b15228ae824f003b45e3bed566a6
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 17232 bytes
SHA-256: a55975959c83c008630b355ee56f82d887c85a7302e3fb181aab4d88a75ecc16
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1