Malicious PDF — malware analysis report

Static analysis result for SHA-256 3443869cd00ab512…

MALICIOUS

PDF

83.8 KB Created: 2021-10-04 15:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 71c42aa685371b3197be95d18cd73ebb SHA-1: 3276f2380f0e3399478db41527a1b5ee80230b25 SHA-256: 3443869cd00ab51204104ec214f7436b47b0e9b1eb90936cffe33c35c262c32a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615652139a6d9---xijefemifepa.pdf In PDF document text
    • http://sevenseahotel.com/uploads/images/files/79921259796.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f49774745---36768286341.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16153707c4bec4---3290185166.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210929115629.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/nefajapidotofejoju.pdfIn PDF document text
    • http://placc.info/up_image/42104341236.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/dovelazowugobelinexibu.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/74374357310.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/94216573442.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109090553168109.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109021253216169.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/karawetawixafanojivas.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/30496428368.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/jotonosipezawigofubudu.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/15498869730.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/nitezupofir.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/13077675087.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/36829334718.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413090bb711---1061757188.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/69360504181.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c1428b97---45869748905.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109302212177350.pdfIn PDF document text
    • http://888chji.com/userfiles/files/97425997544.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/48107734912.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/43226974673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gate+mechanical+question+papers+pdfPDF link annotation
    • 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_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 19668 bytes
SHA-256: 1862c32e448ad84d5fb3005f178a2c9008b18ac2b71e0fdb377c5888e9a94313
font_01_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 11172 bytes
SHA-256: 69799c2e4af33160b9081a1588a9768b13fd78ae1ac892266dc2cfa2a3049f18