Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b30b38aa0211c84…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 18:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b5dcc9d223f5c80673fdad49976990b2 SHA-1: 4f019b8b45342d8b73ceb0e454ebe0a97869a780 SHA-256: 1b30b38aa0211c843e021f23615bbb8f71ef45f0a5de88e9bd55134641a17d02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://de-ko-gmbh.com/ckfinder/userfiles/files/12829506890.pdf In PDF document text
    • https://kokomanis.com/contents/files/vamenuvodurifurabizulub.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613879b36dece---piwanos.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/regudaligisi.pdfIn PDF document text
    • http://elsped.hu/files/file/zesijopos.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/rademerupozuniradinuba.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/dizowakozikufizodata.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/nirivotogamuzarefufaxew.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/jojategorisiz.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/galitebebexafejemaxupum.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/49187723612.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/vadikozuwenotakos.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wosipugumus.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/pesinamezem.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6571cf49e9e08149af0dd08e73b8b3c2/16933187981.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109120728052215.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/30629667545.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a0a2bbc5c7c9fa55058c006d7278eebb/bojixalibovokame.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f11a6aa4---15737582749.pdfIn PDF document text
    • https://proia.bg/userfiles/file/dojejerila.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/wikusogifulabu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/11217759028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=messenger+apk+latest+version+downloadPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/77183414861.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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 16440 bytes
SHA-256: 39d961a64b853efcf7f2661c20a99b09385f0dd1cb36460b734a8a47b9568496
font_01_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 10804 bytes
SHA-256: 005b602c3016d436297a776b60833d61009ccaa1be9b957b0e70ce0faa0ca089