Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ee287437aa8222…

MALICIOUS

PDF

92.3 KB Created: 2021-09-02 02:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 303cd73b56cbf58ae48df7b4a249dfa5 SHA-1: e4d31efdbc7b8c5b4143e0ea6c3d8b39a11eda27 SHA-256: a5ee287437aa8222f773555151167fcd072ea97d23cd96618b39acbf58add65a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://allytemp.ru/uplcv?utm_term=rolling+friction+is+smaller+than+sliding+friction PDF link annotation
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/k6o8ius4b48co2tn45qqlg92fh/14515978430.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/53681265750.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ce4d46ab2aee53da5fbf83b17537132c/53429334911.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/kirilizumabaxubo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0117cda5fd72722cb5d0b1a8100e414d/70317216185.pdfIn PDF document text
    • https://hiroyoung.com/data/files/jabuwamolexonu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/rcdnaacipm7q5h6pil84iskea6/82190144881.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/93965474461.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/49049917793.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/71469817643.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1626390473.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/xevodaz.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/pumatemipizuxo.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/fokuti.pdfIn PDF document text
    • http://redactron.com/userfiles/file/niniwamex.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/kiluwakabetewujakoza.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dbbae5cfa---zedekadojagesusamozok.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9427a0b720---56834921169.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5d475fd2ce1d400d11a5d61d0f894b73/62892084525.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/47796251936.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110b2cdead3c---40536084999.pdfIn PDF document text
    • http://newo.ru/files/files/23363537762.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e6894f66---2132355576.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/poduvobesiwurovem.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_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 19080 bytes
SHA-256: eea6dc4204933f76965057e3d6a084eed8da8fcd687ea5f4ce31e9f0938a5449
font_01_sfnt_off000131a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A8 10968 bytes
SHA-256: 83e54d1d2b8353d991e1c0b28f797b8126d7fbe8148bc092e87c72254a590029
font_02_sfnt_off00014ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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