Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa4c77d9fa00860…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 18:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 177792c740c72e212eeb2de017b7488c SHA-1: 1d32afbabd1d0e2a193758f00236886834bda154 SHA-256: 0aa4c77d9fa008609596b9745104e9882de8dd4793cc85b6c846d864c9d3f9fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware delivery mechanism, potentially initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=watch+once+upon+a+time+in+hollywood+free+online+putlocker PDF link annotation
    • https://artedeeducar.com.br/ckfinder/userfiles/files/32546369124.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/51373516782.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/2e5mjo70b04l1h8v75ug9hlngn/zibajiwoguwopuwukovuja.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394f47e4969---zubamagufavofidaxuledi.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/mexufizurimukezerativod.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/47504061050.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d9deeb0f---36088052064.pdfIn PDF document text
    • http://builderall.info/userfiles/file/11172932812.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/gonadabifawefajufi.pdfIn PDF document text
    • http://sushi-belovo.ru/files/556294197.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210906172212_1379675976.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/fetazejiwunonojagosazub.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/tiribitodiforo.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/62362855393.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/baboseteju.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/44029471752.pdfIn PDF document text
    • http://klinok-saintp.ru/files/20521823951.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/83046649313.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/72694215162.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/81503849550.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161346d213e3ff---zanodukazewiweverema.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/96533599609.pdfIn PDF document text
    • http://hkalc.com/userfiles/doxetapanajiweme.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/zipedezuturewugu.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/60408939592.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fd4dse6s6m4uer10hsnkfo7bi7/65321030134.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_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 17856 bytes
SHA-256: 2c41d628b50fde590f4a01661dcd1dd846e3db18a41f88a7d85ef8b86a2f209d
font_01_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 11100 bytes
SHA-256: ba5dfe0b68e221cec189954450f07d938a065f0b1d6e638693645fc583932e56
font_02_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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