Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe64a06f5ef4e533…

MALICIOUS

PDF

81.3 KB Created: 2021-07-31 10:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5996231579e1c84f3c65ba1f0f0ab08 SHA-1: d639435aeb8e1a06f0fcd8fba2ade55c86014c1d SHA-256: fe64a06f5ef4e5330ceb9de9fbd83a1441f5571054b42c2ff9e6167e262f2503
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the link farm nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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 https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fc365565e3478a00fb2707382310c02c/87188646663.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lipegokejisasanug.pdfIn PDF document text
    • http://cga82.com/admin/File/52414915.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d16276c75---vivokukuruteli.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa9594b52f---giregedutelilekixoz.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e9ca9a03---bemovejabemav.pdfIn PDF document text
    • https://posh.hr/files/zukafaxo.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/90989545675.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1e4e822fe736b8d6375f98c206f12e5c/kojamugon.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8949831343.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/8657526524.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/jpurhgpeq3spt1qvm6naeuodsk/60825856859.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a126be8b80e250cd67d69d73ecb12eb1/42886528513.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///35917885662.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/nixuvagovaloladif.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/folijoxod.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a435eb182b9---92626004356.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160739067ae947---43211017269.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdeed2188c---17108707074.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/34900834167.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0b5643b3ddd295ec80d6e25bb5bbbbdf/51449999739.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/2154869028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=simple+past+tense+regular+and+irregular+verbs+sentences+exercisesPDF 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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 16796 bytes
SHA-256: ad088136c75f37ec27fc2c8e97c54f30c8b39649d6b6521be368e84783663ad4
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 11220 bytes
SHA-256: e001bfc76efa74970df0f05b262e8f2cf0ea2c5265872cd1d9890b3dda890a1b

Open this report in the interactive analyzer, or submit your own file for analysis.