Malicious PDF — malware analysis report

Static analysis result for SHA-256 248925e876ccbf59…

MALICIOUS

PDF

108.4 KB Created: 2021-08-16 03:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fead1492c51974a60d3305ac2918dba3 SHA-1: 18e88659ac8052f9bb1812d48afa51602159b816 SHA-256: 248925e876ccbf59e63723a16129bc9348743daddc73a52ec4c504fdd2c15db4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The structure suggests it's part of a link farm designed to obscure the true destination or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://wastran.ru/uplcv?utm_term=essential+university+physics+volume+1+3rd+edition+solutions+pdf+free PDF link annotation
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d7c4c4945383cfc39d6512034a980333/dupifimiruwa.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nerewejexovekuze.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/lekug.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/ziruf.pdfIn PDF document text
    • https://fasleh.net/Files/files/rawuxakivolig.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/32136407810.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611938055ad6f---nigamafukevedu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87e3acc0f---bagopemizodamumalo.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/31411538895.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/97383504219.pdfIn PDF document text
    • http://irollee.com/userfiles/file/85571387026.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/63248026c3a656a1ea20a2afc68f63ee/2518674556.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/mitumoniwimogafafoxojuji.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1d5c1e2a7aa17cb670881f26e9a8b3e4/vulovubijojaj.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/49469178317.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8df7b45eca0dad9472314b39510eb0ad/rolixadidabudilirepesegi.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/kefavirozimojometet.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nju6fg59mkl67d3e1p8g08a5k3/xulojuk.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec4e9bd78a9dc7a4fc3106b5d0d8890c/gojufe.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d68dfbfe---15331655623.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/60264362559.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210804_214223.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/24280247835.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_off00013ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA2 11372 bytes
SHA-256: e70fee73df0f5397ce81e46a47dcc357c3d9caa77f45a5c73d373d0aab53c366
font_01_sfnt_off00015754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15754 19104 bytes
SHA-256: 1b08be1dcf07a9d3ec35fb7233277f49c33538c8d158c89aebbad78c07fbdda1
font_02_sfnt_off00018a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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