Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c33666add6e294e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 10:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 982debc32bd7022b503027f62fdf1ab4 SHA-1: 58e1daffbebe61082d6179cecf1d4a696950759a SHA-256: 0c33666add6e294ef97bbfb9e07781af05d5aab9f71e33560d8ec9d9da3f2da0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics suggest potential for further malicious activity upon user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=industrial+sector+in+nigeria+pdf
    • http://nonstopsushi.com/uploads/files/jexaxebixuzupinawivazi.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074424d79287---kalalojawosodosalo.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a0c95d5ae---wazeluroriweror.pdf
    • https://shipnhanh247.vn/asset/files/wuzuzududelizefiweg.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0b9lequaoaqjg7vu1vfb95h08r/weputanosiwizumaxomagu.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd070f354d---31696192767.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c073b7d9f34---bejat.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d53cdc13d47---71723219509.pdf
    • http://jogagongu.pl/userfiles/file/nabuzobajoguvilinujomeme.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c77b176a154---78922802351.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/fasasakarenomi.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2918f1e49e---rejorafirufufewujijamobo.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16075c908698ae---pupexawigakim.pdf
    • http://dd-eng.com/files/files/nakofijalape.pdf
    • http://sgpeo.pl/users//file/61150711527.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/v39dvp9uab1j5bltt38588as26/30009340689.pdf
    • http://zhfangyuan.com/uploadfiles/files/lejesakovuko.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ec1r9onkpm3srbd0vfnqtri9i5/27794997314.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210828_3D4B0C3A00E5BC4C.pdf
    • http://vizugy.hu/uploads/files/files/bivamijizaxulanijasawe.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/zuvoloke.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160914e2277dd2---xepedeleledavawa.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc909845c---lenegeragemenizukamasosu.pdf
    • 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_off0000bee2.bin
1545cd57756dda12a7167d405c4398605cc4ed15ba88ca682836bec4cb407745
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE2 10848 bytes
font_01_sfnt_off0000d7d0.bin
ed22a3fe746ab959a2d2fc7b444c4dac69a0f934cb60a2cccea5f8d1ddd88cc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 17496 bytes
font_02_sfnt_off000104a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 16792 bytes