Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f79944de8263411…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 01:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44fdd3cef2b8deb7cb42e03699caf582 SHA-1: feae372ec8db7a8fa24cd8f63be255ff0be4e467 SHA-256: 7f79944de8263411bb554b5bb328ba31320c64d56fae8866d13a807ca549e302
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27eca4caf6---90309470729.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d1720704---81098461264.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/24bd62e6ca6685115a1cbb0f5c8e8f97/39215104894.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/65946772295.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/362807198.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/lituvuvudusevi.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/tafafakifegodo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8d21f41f---xolavijuwojopewukule.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/tamawiwa.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6a7ba4219c32964d293370ec9b9b5577/97705078244.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8f7b8a277---jitumisibukuduxe.pdfIn PDF document text
    • http://consade.com/userfiles/file/32641801547.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/14782045516.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/furovugomozozitezob.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fbac0aa978a---jisozuliva.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c328f44f226---zavojawugomodopa.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/o2c2u36t855qpn25g2iej9bbop/goxeve.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/faserarokutuk.pdfIn PDF document text
    • http://casaalu.com/luutru/files/41843806115.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d04a36682---gikefopofuziminuwamak.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/4174842566.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/71248361762.pdfIn PDF document text
    • https://ambalatender.com/upload/files/wojujakefujiwap.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2ee461c1---nirutazakejava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+regrow+asparagusPDF 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_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 17008 bytes
SHA-256: ef5dbc27d1e59153e9701e13d1ee459cdd9380aa2aba73ee1919b898ca0c3015
font_01_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 10360 bytes
SHA-256: 0e246cf8cb5c99d9c835e44f969c16f41d80a8b2f8e0e073c1126d8601900b6b
font_02_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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