Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d964e4b07512ab…

MALICIOUS

PDF

85.9 KB Created: 2021-07-14 09:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 965debc2a98e936302f6e3d7c0f160f5 SHA-1: 00279cd03c3d292e333cd8ffa0d22ab9877e30bf SHA-256: f5d964e4b07512ab6e3f187c7b3b03c0f3dd34f61eb80f38c98ff7be646979d3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for distributing malware or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm suggests it's designed to lure users to malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://magooferta.pl/uploads/fck/file/disos.pdf In PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zugonagelozimifaxetirada.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/43ecb545604939a8c1e03e974f0b5989/visaduxiduse.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2ecc9aeaa74821f776cbb816825b6846/bumuwaxizazaja.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/vanogosevomipifowuvolome.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f2b4a1f7eca68c43714eae0097fa66b9/gavunujiku.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/fuvunuzuj.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/gopetememik.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/61727314825.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfab18f85e---18879288261.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f957ea968---65086476456.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160927e2fa443d---2180321145.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/5895768809.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/gamer.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/jobagegonukabuj.pdfIn PDF document text
    • http://hrudolf.com/userfiles/naxeseretezudafunizosasom.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/1827682301.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/krp1bu59qb0018sqijriskumb1/14344475038.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609657a8060b2---getuwukoris.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/70cf7ebb9990dd40e35bd0fb0e3fe264/gilidon.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/47166243969.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e49d41088b1095a7193e099587020fe3/rifufetirexerepetoseku.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/47684455079.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/lasug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+can+i+save+pdf+as+jpegPDF 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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 10824 bytes
SHA-256: c19eb987ea5b72abb591af2a99ee8143ba913fb99ea3d179d335be66464c00da
font_02_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 18156 bytes
SHA-256: 4661cadf404030e1ba8d08000acb342bfb34042a784f9d745a14e13672831ceb