Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a8c35e48f9c9d5…

MALICIOUS

PDF

92.7 KB Created: 2021-09-04 22:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dead1f92d43c88cd5fc1e30ee47c9331 SHA-1: af1cf9e96d499ee6552e7efcce1c8944146c0b14 SHA-256: e3a8c35e48f9c9d5a83ee68c8c53bbbc54e861109de609f46e4e360ae6800712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=life+science+grade+11+photosynthesis+practical+pdf PDF link annotation
    • https://ebooksweb.net/files/file/60345080630.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/33420990778.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/xisifekazozopijurol.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vgj8b1rruov5aj67dgfseui6vn/44460506008.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/do49ll4k1clb17g5hd9ftrc144/zibatamupoxagazifejedebox.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/51530195207.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4c2dc721a4438248e620800a5bc9b87e/ferilodixokeva.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c3652dd1d---jowelawemugikileluworag.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/5333989147.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3ee4b582---40391778753.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/92789c9abef7aa01d9d713b5ca0ae2ab/vizanarumoki.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7400fc14aeb8640a916e32da003e4ef3/wadojegajowami.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/70936525452.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/feniruvokobarepiro.pdfIn PDF document text
    • http://nineslash.com/user_file/file/mulaxinujulisaluzolosuvu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/7138894619.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/48761272384.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077db03d51bb---98552835930.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/u5c1nvr1giqi1breuarsk8a257/ropedesevaxodewuvigirax.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/26809697176.pdfIn PDF document text
    • http://3asoft.vn/img/files/suvokilagofuvufavig.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/newineruxevewe.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/15385139704.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/78484358421.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/23010366771.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 18896 bytes
SHA-256: d72b4e572a7e3f92d141ef6d6fb2ad52d82218d0eefa1c9fadf18a7554621ccb
font_01_sfnt_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 11024 bytes
SHA-256: ae7b3744dac77145ba840f262d1490dcccc08710400416b2126b7df08ba7ef5e
font_02_sfnt_off00014c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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