Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8807647d020db12…

MALICIOUS

PDF

78.3 KB Created: 2021-06-12 22:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 97fa1246879cec001db5303d0cdee940 SHA-1: 6824335565fd6352407e4981bfc98716e34c090e SHA-256: f8807647d020db12164e587886a26357b13fa349e64375f9d4ddbfbf3cf5a774
164 Risk Score

Malware Insights

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

The PDF contains multiple links to compromised CMS upload storage, suggesting it is part of a phishing or malware distribution scheme. The presence of a 'download button' lure and the ML classifier's high confidence score further support this assessment. The document's content and embedded URLs indicate an attempt to trick users into downloading files, likely malware, under the guise of a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=gta+5+mobile+free+apk+download PDF link annotation
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c4cc148d---xiziwisalutigoluzeluro.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/id4cdsqn74e5vrv1c0getk5aln/xexawadetemaxazuboje.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ird6hvbhs640v33qd98736h9t4/778916296.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160994aba9fa0f---komugixupediwifibopizu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/1572566074.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/kapevutulewixubotep.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c899c00652---taxegokufivufaf.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0g49en8ie76q8771s6bi9dihgd/giwowof.pdfIn PDF document text
    • https://kham.vn/userfiles/file/rixozelujej.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f09267a357943815dcf03b924ad2a53f/lizemoradu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078c017243c9---14778227039.pdfIn PDF document text
    • http://zatacorp.com/upload/files/90266873692.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9a887e72---14083850001.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5a6395d68e32a4a78025fa73dac1b464/vamutigigodowalixib.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3517ed257---peposilunorov.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202154357276942.pdfIn PDF document text
    • https://superpart.com/files/89128601060.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 5460 bytes
SHA-256: a11e61270946d3f0fa2a1fac306db6c06460e82bb4cb1b905193c4876a573130
font_01_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 10968 bytes
SHA-256: 943d485d5364bb50d3b12b896ab75600b86a4918d830f1f59551e78cb1fa1a63