Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4632832e5c422d…

MALICIOUS

PDF

75.9 KB Created: 2021-08-22 12:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d975aa98dc508bcb9cea3cfdd4cf138 SHA-1: c0123b52407797a3ff6317f3acb774fe66056667 SHA-256: de4632832e5c422d9f4b093e0f0ad177ff60ca96bf82d12abed10a641a377bac
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=kimyasal+t%C3%BCrler+arasi+etkile%C5%9Fimler+%C3%A7ikmi%C5%9F+sorular+pdf PDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0462bd8bd---32869375077.pdfIn PDF document text
    • https://majubesar.org/contents//files/futuge.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/cb691cade09ef59b61e6dfa9b9919d30/4168806824.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/75249508527.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/81628289581.pdfIn PDF document text
    • http://djpress.pl/Image/files/19244824822.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/94341538480.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/52044090069.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/sisonaxamo.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/046c90b96a22abc44d1aa0ec20305fe5/62140554751.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120d7349ed2f---96252857189.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/73788564325.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/gulijosalulepaxagero.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210622191049.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/fopalujaridepo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f118c4aa8dd6829f371a86564404055/20019752130.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/12525818679.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/5150893848.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/38425063236.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/litavanizomakom.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/24900566694.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/ropaxufoxixegokuxer.pdfIn PDF document text
    • http://polletnv.be/uploads/files/funufovuk.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/92718218914.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_off0000beef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEF 18788 bytes
SHA-256: fd854b687e25c7a2cd375c89660ded02d9e6252abea760d9050d3264ea703f01
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 11484 bytes
SHA-256: 5ac31d117d21a8600986d968d7e114a33bebb696064f54d71f6f433cabb24411
font_02_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1