Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a483873bc5684b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 04:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca17f02cbab72a069f4172e3c96dc059 SHA-1: 81b99e64736cb670ff1d84d27d9b5829b6a8a7f5 SHA-256: d8a483873bc5684b531e705ab2f948c5a9e7f90455f0655d2b36f88d5a56fb0e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple unknown URLs, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409dfcc84de---mutisibovisepemir.pdf In PDF document text
    • http://dreamscar.eu/userfiles/file/gupetugifolesekuselitojir.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/69150781311.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/zikosufalutupob.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614102263326b---worexenalijibititinetax.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/zopofiw.pdfIn PDF document text
    • https://afma.pt/site/upload/file/43967817734.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/kevomopiwoxokobepawolile.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/mosokedizamutuwa.pdfIn PDF document text
    • http://baove24h.org/upload/files/lilijiwi.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/sipikujubafun.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/40964828612.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/49778330175.pdfIn PDF document text
    • http://computerdoki.hu/user/file/51301932603.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/jalinel.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134add0bd318---dilokimo.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/24571947352.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/pilurupinesijugaxusizewi.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/36563421194.pdfIn PDF document text
    • http://beta-rc.com/upload/files/saguvebururojakokuwisek.pdfIn PDF document text
    • https://ebooksweb.net/files/file/28451983909.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/65347409704.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/11662936459.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/2384715976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+caller+name+announcer+appPDF 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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 10596 bytes
SHA-256: 4d8b445f1108e717c92d7d5be348adaee856443b2886827d291e7649bc34c01f
font_01_sfnt_off0000cc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 15008 bytes
SHA-256: 33f5dee4e45fae5bed086b9369681f4d28a01bf1021a829c38245ef1410a8a9c
font_02_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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