Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce208bed34c0238…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 12:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: adc5f4a3732cdef2ce371603393a4f65 SHA-1: 93ccf72dfd0ecdc66e5bef50c8c032e9726a6908 SHA-256: bce208bed34c023833962e098b6214f4184ee2ea80dc9f6443e4d51fa83d85fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, although not directly analyzed for malicious intent in this report, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fabriquetextil.com/js/new/fckeditor/userfiles/file/74596599837.pdf In PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/9072509073.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/kovibugomitobapuked.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631171160.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/detebulixusepaziteneje.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd7f64176---99411281100.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/67189182042.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091114520817046.pdfIn PDF document text
    • http://nfc.soo.jp/file/gudewuxuwerigage.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161302e5a78fc5---2863099595.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/15297379565.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/mokexaze.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/83028688227.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109121503574681.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/rujevuda.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/99020036597.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/23690407583.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7b9bab033d7badcfa01e15bb8054d229/pilagakolalil.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/4963569724.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210912_3B536406F9712A85.pdfIn PDF document text
    • https://33mobility.net/uploads/files/jukekogozexoteteme.pdfIn PDF document text
    • http://biomehl.com/images/content/files/5662950483.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/vaxolijiduraxixisipavin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=animated+lock+screen+wallpaperPDF 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_off0000c1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D0 16864 bytes
SHA-256: 23df067563231de69efc1a47baf83bf84e49eac77b4910279bb066cb80ae5d59
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 10836 bytes
SHA-256: 4f6fe0beacd7612599e5d42a10cdbd3e67970752bd5b019cdfbb82401e2a3775