Malicious PDF — malware analysis report

Static analysis result for SHA-256 98637793fab46a65…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 06:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f425666ecbb33950c821082669a15de SHA-1: e12258a3eff8962ba4068da84c6c77d64f082206 SHA-256: 98637793fab46a65c49b1cf5252b5cd2e2bc1f5fd8bbb7a6053a7a008c405ec8
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a high number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a download button lure further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://fcraregistration.com/UploadedData/file/48426721045.pdf In PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/19302602358.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zimuz.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d11d82df2504d6343a668ed5282b68d0/38552362982.pdfIn PDF document text
    • http://teplospectr.ru/images/files/75199036752.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7d6fd2f54---jeruwagi.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/43689830850.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/nepejofebiluwiditur.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/vabalovar.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/bolabedu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444ebe86e05---97512699702.pdfIn PDF document text
    • https://hse.tw/upload/file/jojagutenen.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/jexifaximuwujuxadavadup.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/vutaboje.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/madudivaritoruxumam.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/87195438021.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/kenidositanaroduz.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/danizoxekerot.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/luxigotowetezubamoxa.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021920442291222.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/40795439361.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/lisadofapedimogewudolol.pdfIn PDF document text
    • http://sro52.ru/uploads/files/lakomilagujavasil.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/4671813360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=project+igi+download+for+androidPDF link annotation
    • 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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 10700 bytes
SHA-256: 8d3281c5c52ec1519d82e2da710be085b879ead937c8e7875fd7912a84c1bea9
font_02_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 17244 bytes
SHA-256: 17ddf4bf23e7f06ec2e82e2002736b7f78c543b8509573597089f768a670c3cd

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