Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7116abfdcaae53…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 22:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a1b5f07638aa82836b1bd84d011b607 SHA-1: 75bf5f7038ede9856ed2306d06c71596d5e97358 SHA-256: 2c7116abfdcaae532b87b25185e0b758f106ca2ee016ba52d411c2a63b90ce77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to be a link farm, potentially for SEO manipulation or to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=cara+menggabungkan+2+file+word+ke+pdf PDF link annotation
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f034b612779---jujevemunojejezesutuk.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/96239899210.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160706bb780cee---922196190.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4d891a3b0---zovusawexidatefi.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/jakugapijaji.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/83670205868.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d5792e2f5b4f70365eceee40e7a01f51/ritavasosevemodumojav.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/8426191509.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/u7qp29gj3a1gc0709h5tlkpl5g/44435428020.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/25681388778.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kesimilemotopezozigav.pdfIn PDF document text
    • http://klpa.net/userData/board/file/63027640363.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/gudif.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/rizarivovurusojuxifad.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/93094452361.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/38489417652.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/vusukonadimeduxedopo.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/weporuzuvinirasovafiz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cf6306a77---17558803496.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66770a3da---38267541347.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/13980d41a1c4b6fdba7dd203dc34a7e5/43781308617.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/9r5k0hhldhilclpig7dtk2hkc5/kidejogupugoroduvazeki.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/loluf.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/90486335561.pdfIn 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://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_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 11144 bytes
SHA-256: 0a3e388159aae703f6c1703198a9815dfb1f0ffc5a281b935ea88afc3f151651
font_01_sfnt_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 19072 bytes
SHA-256: ff240e5db43d369c92bfd748a2301f037e51e372c6a4ad4e8fb02e714edf2725
font_02_sfnt_off00012f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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