Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d9571359237eb4…

MALICIOUS

PDF

81.2 KB Created: 2021-08-16 04:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6409c4dfd10dd5272ce5453a1d2cb53 SHA-1: 50b319297760d583d170a1df8b369a221f80e38c SHA-256: d9d9571359237eb46aacbc672ca0ce7b3820772f237e50151d997bf6eae799ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. 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 document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jcmimoveis.com/userfiles/file/xuliwimizezapof.pdf
    • http://hzdsbg.com/uploadfile/1621115031.pdf
    • http://100gastro.cz/soubory/files/79061396328.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3578bb67a---94947761763.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eda975f21---7275961643.pdf
    • http://baigeleather.com/userfiles/file/wurebelimigatufevaxodu.pdf
    • https://alice-immo.com/userfiles/file/fisikadasasoxagi.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qtsug83ijpg01uol5pn36a0t8g/noxalalevexutazemibenokaf.pdf
    • https://aquafilling.com/userfiles/file/bajomugaripobozuxiki.pdf
    • https://vieclamit24h.net/upload/files/93569754254.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b14703f48341a5b55e37fc1a8491e186/gedikemorino.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d229a2d968---3359249003.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d60b2a491---pupefuwosikomu.pdf
    • http://korea-labels.com/ckfinder/userfiles/files/22510883258.pdf
    • https://uclerbaklava.com/resources/file/66052171868.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe83c1aad4---pazijudulonozutatopatuso.pdf
    • http://alphasigmaoverseas.com/userfiles/file/20380698992.pdf
    • http://cmtsport.com/pliki/12659718585.pdf
    • http://moscowballet.ru/userfiles/file/5769283634.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ce24d36e0bdf5e96014e498e273fb00/lusukemuturinenefabejes.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080984ba9005---gosejikovi.pdf
    • http://brlairport.com/images/file/85209966522.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hindi+film+veer+zaara+full+movie+youtube
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 16792 bytes
font_01_sfnt_off0000f45c.bin
2df6710d3b074b33f110c464b959b7f8cd9a25d8e96985176e020106209341cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10816 bytes
font_02_sfnt_off00010d40.bin
80461d671480636fcf582b48d18e4356b6d0d47974ffca1acf90943aa3f925f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16524 bytes