Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cd0a18dd67f1c5…

MALICIOUS

PDF

86.2 KB Created: 2021-09-23 21:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f4e5f6074f881c1c319c41f3794fc70 SHA-1: be5cdd3db129a87e1676d86e9e24df2db2187aad SHA-256: 88cd0a18dd67f1c5c19257e2ea951c299f563801ffa16d9f6f354990b5452daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=graphing+app+for+android PDF link annotation
    • http://4reality.cz/userfiles/files/18851171316.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d2f023447305a74d9ac35098ef063d1e/62734270691.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/xawozekemuduxatig.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/74519721300.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/piratew.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/nuzazebubitomijowixaj.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/61324095065.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/tiberomamawi.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/goxogasesuvibujobog.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/10255213614.pdfIn PDF document text
    • http://gibisch.org/files/files/68669152442.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/jorusimezodizutegukagul.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/rodexonubotegukabo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/86594770921.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/54240476052.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/bipefadefarukigoxojodi.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/5604243065.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b44ea53b3e---kifumufatapemabu.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/dafizibejutur.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/36521455283.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/piretefaxuvunidatalise.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109191850348808.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/95089195239.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b1d1ed3517eb0995cd923c60e4da4544/gagulakavi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407fdc85592---gozasarazago.pdfIn PDF document text
    • https://ocw.tw/uploads/files/tebakilanizafiduseg.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_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 17180 bytes
SHA-256: d86f3ae12dd12a9766b40072288682c6e41592e782d9ea3891755ab782b5d391
font_01_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E1 10372 bytes
SHA-256: af22b3ac368fa2b812edd14a155eb5df1d82d8a10495a7226997c299ccaf7da3

Open this report in the interactive analyzer, or submit your own file for analysis.