Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba1b76ccf8eaf35…

MALICIOUS

PDF

89.8 KB Created: 2021-07-23 05:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d0223e484851c4784956fdf10000ca2d SHA-1: ae26bf8480ed5446c8a47e96fb91cd24413f418a SHA-256: eba1b76ccf8eaf355c52cebe9aba9af08886baafecf008b70bdecdfcade990b4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. The presence of numerous unknown URLs suggests an attempt to distribute further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2384aa206f---26629763827.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c999e48264---pumadiboli.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/65501559064.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609048ae29058---14056745047.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/kuxuzonojoser.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/58481377476.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d40f6daef---kijog.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-15/20210515175101774064.pdfIn PDF document text
    • http://seamacros.com/upload/file/26827713481.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f798bde3---73552309056.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813da78c7fe---kaluxevuwosidufe.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/11262701985.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1868c93d5---pofajejaxawutak.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/87739890954.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b77c95c4672fe9f0a3d6f37dc671bab5/tetotebukesesidapel.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/ravuf.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/85574048288.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/mujizixi.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/27664590113.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/julajazolip.pdfIn PDF document text
    • https://landbar.com/upload/files/88914542295.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609358d973d6f---bidebipik.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/70723734208.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/vilaz.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6901312608afbcc08cf8a929830ae384/xixiwirakikavuvolota.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/pigopojimasimoladavufujuk.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/19607145252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=rydberg+constant+for+hydrogenPDF 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_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 19292 bytes
SHA-256: 56780562bd0489ebfab9034ef0a382d7156cb72fad0ebb9503f58931d5581e85
font_01_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 10916 bytes
SHA-256: 13972c990f2bf5a7c59e7840c96f7a1d72becd60204a7f01a9ad8550688a76fe
font_02_sfnt_off0001409f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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