Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b5dcc1134e72bb…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 04:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2e786baffe20bb83eb4281ef5bcdee7 SHA-1: caf05b24df67e69a5569d51d2efa5a41e7c680c3 SHA-256: 54b5dcc1134e72bb7058aa31cc800db3231f3a8e6a922e00728b3b9d824d4f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics suggest it's a link farm on disposable hosting and potentially uses compromised CMS uploads. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=egypt+christmas+traditions PDF link annotation
    • http://nut-shell.net/upload/files/bixedadekidosoriva.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210918_091845.pdfIn PDF document text
    • http://velisend.ru/photos/file/guborikupebiguwen.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/waroxofu.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/24602143081.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89546165303.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/67086759384.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/80417697331.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/79849706505.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e334e5808---suneguporawo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb58776327---52815115093.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/16387884352.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/20876751289.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/87185642454.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/wulugi.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/tiwawe.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/49189437961.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/72438052640.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/buk6ufeslmhdf7avodu4brcpp3/21892098886.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/diker.pdfIn PDF document text
    • http://hflchw.com/upload/file/38615936704.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c407144f3---natoxadafixovirujaripot.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907233133.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10a0d7281---jotewetubatuzef.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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 15292 bytes
SHA-256: 8bcf24a52bd7c09894203b92889abe40b9729fc6ca801288d53d585a9c85cc21
font_01_sfnt_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 10880 bytes
SHA-256: 437f7e2fb7dae4aa3759226fea3766e73af5561cb2a92e5ef856c0fe3e605e11
font_02_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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