Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77785c90fb87dae…

MALICIOUS

PDF

71.4 KB Created: 2021-09-21 16:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 150029b521024563a088485ca519abe3 SHA-1: 12eff55e3e27c23d8284c464bfc622b1c2d0f00b SHA-256: f77785c90fb87dae00162ed92d9f7fa1f58bff919ffa18b33088064ca4df048e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, several of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/2242841753.pdf In PDF document text
    • http://kleinschadenexperte.de/userfiles/file/xesatojiparerepuvid.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/43857782873.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/pufali.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/lizijutolug.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/fivubuge.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/bosikeni.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/pebew.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/68879952460.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/livabib.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/18298963461.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/togesanimazigupavidegefo.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/muzudosiwu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5addc556224d8ab690faeaf7663bee15/12721319447.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/23393328950.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/julovavaj.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/70174279777.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b7a67929c64a450a54c9485e4fed9ad/34373788952.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/guwepuxozuwijoduvodib.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/p75bjn9jvllv64or2a9v0du3tn/xebojitogasogezasagiz.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/1048056788.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d761535e5e---82415043678.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/fefuteroxojipukunikola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+call+of+the+wild+full+movie+with+eng+subPDF 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_off0000b3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AA 11176 bytes
SHA-256: e0377c6350541146981eeb1830d2d1800ff6442a7509a6024c792dca84399815
font_01_sfnt_off0000cd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 16368 bytes
SHA-256: 4dd8a010cfe8e76d5b35a1fb6a8d8ff4c2178b785c61215069cf92ca75a033a7