Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb9b0267755c011…

MALICIOUS

PDF

79.5 KB Created: 2021-09-24 04:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58215f8a8f465cefbf9cd8fa2f8f3956 SHA-1: 95490f46848e634c9aca6478f32b11789f9e79ed SHA-256: eeb9b0267755c0115b680df767b89acdf6a22f18be1be05d69dd59dc7651f1d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised websites, suggesting an intent to redirect users to phishing sites or download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=android+custom+gallery PDF link annotation
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/54320746233.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/tisutoviwaviloj.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143927552fa8---lapepudi.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/5372443346.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/vaxutaroraro.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/petumepizupejudi.pdfIn PDF document text
    • http://stisk.com/file/ledojomaze.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/gajewofudaw.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/15375750230.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/42802142800.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30788a6d9---31238305825.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/kizijekulomasatomegojo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/28405be9a60e1cd76f83de56774c03c1/gobojafoxiv.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/galevafebewar.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/64499231544.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/45625170672.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8516a3f27935908ec9b6ad74847f756c/31085344403.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/betajolefilew.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/6475037839.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/80628763219.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/610be1a86d81c3af2b641aae1ec94fc2/13022414131.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/nifovegowijanafegagid.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/92469652432.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210910111004.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210905_DF45A0F562094C9A.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/89809993866.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_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 18328 bytes
SHA-256: aac6ad15a74009ab4c10e4ef9c9b249fafd6800c9c51732fd739bc2871975a91
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 10908 bytes
SHA-256: ff1876223bfe04f3cf8dd5584ebd428f4cdff8b3150ca0f9576b048ce26f892c

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