Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50d8bd781090a0a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 10:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2e73c0bd70551bbc2b41958c5f4128b8 SHA-1: 58b5c563ad5fba76ad2742da1d8e20180119685d SHA-256: c50d8bd781090a0a823bc91c9ea90904910629a3e35164f90194cd7607546974
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://rabudiagnostic.com/userfiles/files/kokiv.pdf In PDF document text
    • https://curewelldiabetes.com/userfiles/file/junerawevutodobufupava.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d038171ae6---64366163064.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8626ae25a3ce3fc56e71f72e4fe48703/jujamivuduzox.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/19484014958.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/53001596911.pdfIn PDF document text
    • http://dgjst.com/upfile/file/semepezilozukere.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/96304039319.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f65c56d7e83affd035dd6f78aa19a975/60210129631.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adecdb3afe3---72463738827.pdfIn PDF document text
    • https://europartner2.pl/uploads/vagodeletegakevutogewe.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/10763442989.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/62441610717.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/eef10412f85b0cfcf96d46043bb96536/59620810394.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/89089900869.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/96sposdipcakqe1eushl3vv4tv/44998423443.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/bovixalikor.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/rodomofifesobiset.pdfIn PDF document text
    • https://anfauglir.com/images/file/69432730546.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/10104187236.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c6fa6b716---7451887509.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/vufelemogetobafefawet.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/m5gpklm6rnt8468t5pm7no6ab6/xawanevagitigutak.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa29fceaabe---luzer.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ff5c13437b93bc58a1e566e0d9133ef0/kowemolibekujen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dilated+duodenum+causesPDF 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_off0000c5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CD 16520 bytes
SHA-256: d5c6e0ca14a333c8340806e2b84b2062a825d118bd290a2b4a76350405942fe9
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 10532 bytes
SHA-256: eddc50a53680da607914d88ab14caa56fb662bfadc8a8841b118e938b5dac875
font_02_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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