Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c280d5b4c955539…

MALICIOUS

PDF

66.4 KB Created: 2021-08-16 14:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab401a1fd3f57a2acf5a6e8e7a7f918c SHA-1: 463a4148c41d79aff3a27378bd94456b6c7d9df0 SHA-256: 3c280d5b4c955539165203c7b30d647ed928f74305fdff913148ea43e59188b9
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8520

Heuristics 5

  • 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
  • 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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d33186a9b---84980211840.pdf In PDF document text
    • https://llsindia.in/FCKeditor/file/31661103361.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5cd5b0234---buxinifaro.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a4b1f21c---78869075962.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a11dbb0e37---jaxup.pdfIn PDF document text
    • http://rcot.by/pics/files/84998039550.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/5864243504.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/pipekajilamel.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee661a63a---58903171637.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/tupevusireteb.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/11274622.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ed9820b3b---64657521611.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/zadafugupu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8437899dc---libeginoz.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5341e7ae8ba1f351981cd2cdfed1e146/81072598779.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f26e8501e9d267197f4e61e94df3716/dovigagosuzewutak.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/40720707214.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/parogakepipezulitugoso.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/kotumivoxowusewafoxetu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f9c401e3c---wenoruzu.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/20963592047.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/907955be9f24011770584252503343c7/79915032636.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/depiruvojuwefana.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kojolibiwel.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5365f414eca82b367667fd2d49686425/53059221844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+reinstall+keyboard+driver+windows+7PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1