Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9ef131685f9b1e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 05:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b46bb5e8d94c6acf8f7c181b500089e4 SHA-1: a6411e1f7caf462620ef9b7a22208d4e2fbbea32 SHA-256: 1d9ef131685f9b1ea47afb69cc65efd605e20e8d56bd3177b695460e0bc31b43
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains or compromised CMS uploads, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns align with common techniques for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=vanguard+full+movie PDF link annotation
    • http://regcureguide.com/files/files/girafax.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/fajofatebudikemidufenobe.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fubanulu.pdfIn PDF document text
    • http://short-story.ru/upload/file/dikewadeniranejekemurolu.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/95584860401.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/lamafidovelowexilexobasa.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jagavopaboduj.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/56290649450.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/7412753510.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/wuzivitawe.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/gitegiguxulepukitofas.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/50a31d093f875f40ef1581bacdf57815/35559824314.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/56d0ad3387b3f2379f3323b9bd3c3ba5.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/dujinejarameto.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/lumiwod.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/jazenotaw.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/92434121243.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/95352784545.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/wajevalerofaf.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/oa426c5bm1rf7g9mulunm34707/47618071770.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3636d6b0---pedulexujunutunutojevogo.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/tobunolexuxozepam.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/walozegapit.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_off0000bad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD9 10568 bytes
SHA-256: 519ed5d0dfb7de53dc310c8aeefef207f937343b6336cc27a8d5bbbbc7e21d27
font_01_sfnt_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 17704 bytes
SHA-256: 74ff324b853b0a97d50211d881277b26b0fb049b4c4bbb3b8c6396b17ba42ccc
font_02_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1