Malicious PDF — malware analysis report

Static analysis result for SHA-256 04877d5f8355c493…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 07:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 894d08b4defa337301a9c70d15f22b68 SHA-1: 48db6682f8e3e28c1a7742d8122406c135337bd0 SHA-256: 04877d5f8355c493cddd53fe20aea4ec7f623165857493d2bd37fd5ed4f46d87
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crysiq.ru/uplcv?utm_term=elementary+os+file+manager PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0502e481---degiziwij.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/wuzinobusuwopuwizefojike.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/aa661e5cc1b4663fcf9ce386bb4bd3af/57944043765.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/lisakidogorafipez.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd0be60837---8316077487.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090603461813.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pamufiku.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/xumatux.pdfIn PDF document text
    • https://norservis.info/files/files/29665928553.pdfIn PDF document text
    • http://vaynhe.com/upload/files/gumilulapelazixor.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/65c7e9cddb7900a3cf1c2f51327894a8/dinozuzupabolozetor.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/ziwoxutisiramudufimavenuv.pdfIn PDF document text
    • http://btfa.tw/upload/files/zevijigamevejewevipanex.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/15103249582.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ffc58059d94f292f9d847cd6e721bf04/31305398666.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/59598228340.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210912040503.pdfIn PDF document text
    • https://vzglavniki.net/data/file/41368415393.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/fivujoguligiwojupi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7db6c54998676354828046a58d1f95ee/69058667574.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338d2da6c21---rabedeje.pdfIn PDF document text
    • http://handgun.ee/media/file/zogufabilexi.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/ritijekuno.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/15821701174.pdfIn PDF document text
    • http://puisan.ru/uploads/file/43044798511.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210903155914.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_off0000c99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99F 10656 bytes
SHA-256: 4265514ac8976a05a6fa0dc3c8add7c4683f4be223709de322502b570428c405
font_01_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 16668 bytes
SHA-256: 6e01986d37a048df89714b1833fac8eefa178a7c722a3fa371de200152657291

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