Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dab7f62fdffebc…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 07:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6af95015c991ca113d887f48be42989 SHA-1: 46446f7b8c8963f78e332e192f7c274aad43930c SHA-256: c0dab7f62fdffebc6e42406cab7b15156f9e1b8450dfbb61c6cda0a848dbd39b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://contabil-fiscal.ro/mm/file/18174337218.pdf In PDF document text
    • http://cokhibaosang.com/media/ftp/file/wedenajubupupu.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/fegekojunezagodu.pdfIn PDF document text
    • http://zae.me/datafiles/file/97753074305.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/pireviru.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/petowaravo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f484cadb609---9543463495.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/37229646710.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/de79d71d621bbfc3311c7c7eaa6bc0c9/70600575363.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef741873da---20945169438.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb16d598d---35855484848.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e3faa3f7a---kolosaresofapiwezumejawa.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f30303ec067---runixevipudemubebapun.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/4844242242.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/tikukapemotaxisozumuf.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/loxirokagumosodiwipe.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/28520689594.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/9d86a7pdkoo9gsfvemehq0chn7/leruvemakewogogesup.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/95352195837.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qnvn39v83o7hb3j4jj7impngtr/jisurogalekonijuxipevep.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/zedebisa.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/xegiradew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=al+mathurat+kubra+pdf+free+downloadPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e336ee0da4dea692e7b3c03d885e1beb/15478388642.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_off0000d069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 10900 bytes
SHA-256: 1b05ced7ee241cac31a979a4456105c11c758bd33b76168a875126d834dedcfa
font_01_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 17376 bytes
SHA-256: 8268c3928ea5ba9de9f6a11f0964071d850ce05a8236cbb291971d4891419053
font_02_sfnt_off00011637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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