Malicious PDF — malware analysis report

Static analysis result for SHA-256 13759a2313eb3c02…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 10:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a76530b0e7773ba7b92ad5aa798ce23 SHA-1: f0ba7a1b3208a4c34d7bb99f5503fb5bfb57881e SHA-256: 13759a2313eb3c02d87ac718334ff5f7dbf77c46148f2bc5faa6e0a67bf5ffb4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161440fedcee90---jugokajolidaf.pdf In PDF document text
    • https://milorem-service.ru/userfiles/file/99830710670.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/44291741019.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/muwezulaxulavitowirokuvud.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/356061e0eade1266560aff981aa77b71/50977944806.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210903182033.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/natonenereguwepidegopu.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/82344049399.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/jukuno.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/86770668810.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/24186646011.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/3937316027.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/27531534092.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/duxegusibajow.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/sebejuzowepafezokinoja.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/91555833939.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/16261029649.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631563819.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/tabareronosigopavop.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161413a0203d6b---72142517905.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613492c94e36b---96215678848.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/66987250651.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///59148848902.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/49367457907.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/61262898821.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/mejero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dofus+sports+live+streaming+appPDF 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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 17504 bytes
SHA-256: 661052f789df9eddc20d9167b1ae5408e79341d667d39a32290234035e31a2c8
font_01_sfnt_off00010f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 10868 bytes
SHA-256: 8622390aa7d22928ed44647ed60735167a68b2e66bb37dff62fbc4a99113a3f2
font_02_sfnt_off0001284a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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