Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6d3d63d51b027c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-22 11:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0955abc931aa8fae7e8777641dc7abc4 SHA-1: 26572486bfbad0dbb1010341670ba0cddc23f3c6 SHA-256: fe6d3d63d51b027c797b174ccf6106cb6dd2daf9c80660801904340ac1eec350
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

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 https://pistant.ru/uplcv?utm_term=free+cod+coins PDF link annotation
    • https://krainaogrodow.eu/zdjecia/fck/file/5108435095.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7ab69d6cefeea9c7702c6bdd33c76b02/zixepu.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/fugibujuzemogoxidojonar.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/36291906309.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/10555222001.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/6564485527.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161301a6d5a710---42757378124.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/84449300033.pdfIn PDF document text
    • https://losungversorger.com/product/file/sowugotabi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8d800b0e---22517694416.pdfIn PDF document text
    • http://snft.ro/media/file/36371587920.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/7082771882.pdfIn PDF document text
    • https://sanagustin.cl/files/savefenimiwusajak.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/jibifoguzozeduwates.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210918_568695AFA700F22F.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/nexarusulozewem.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/91352087559.pdfIn PDF document text
    • http://cecev.com/stockages/files/wuvasefut.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/3raep19a172f2s9rr09r622hgn/50196461486.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/pobepik.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/bonezaparefixo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137ada3de063---xemub.pdfIn PDF document text
    • http://trivio.it/userfiles/files/mubuxer.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/17529498529.pdfIn PDF document text
    • https://lapdonline.org/file/65739115364.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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 15884 bytes
SHA-256: 6b5ad705cc0ded745daef96fbae7110f11f027d810b2376ab967abbeb610d0ff
font_02_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 10032 bytes
SHA-256: b21684e0daefced0ee9c5c55281feced9b22bee8b3c1332933a8d2fd47721bf4