Malicious PDF — malware analysis report

Static analysis result for SHA-256 a801f66cfa714fb6…

MALICIOUS

PDF

105.9 KB Created: 2021-09-08 03:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a1a2288a9209e5e0f29f6a83e109015 SHA-1: 4f4395258dd417399f0525816bf5e87cfdb5dce5 SHA-256: a801f66cfa714fb6c07a6bc0bb07eec0b4b7c551df3ba8e903e78b93ff694d4f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of many external links justifies the T1204.002 technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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 http://drapikowski.pl/uploaded/fck_files/file/surudikesuzenelekugopepe.pdf In PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/dumalem.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/35775758b114875b566b0a55ee808434/30677183869.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/60855c569a616614e73f8b2266a52f45/bewubala.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/98010390781.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e25bf0b66---serezezaxubalibikere.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/zaxoketukonejusomez.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c6411d0a---kuridibifokexurujupajis.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/12093135868.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6937dabd256e237074988b69d4b9d092/92551826985.pdfIn PDF document text
    • https://scalping.ir/data/files/file/30812105938.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ca473df3---moxepazozuworunapipiv.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mv247cqf0ji3uqi7hf5h66bsh5/foxilimiw.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/zovipifalajase.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/32557727531.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/93477400929.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/96293649144.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/97567f6ae5883ad5c3a5775d396c5cda/59153399732.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/durepironifusisa.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/747c689ad71a4b12fce694d372c075ab/71609114829.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/51118518952.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd1de682d3---wufajo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824e0ea5e2c---navikituza.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3cf4d059af183d7758b574e79424a8ee/fewaduwosatabuxa.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/25652524075.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/57616736589.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dsrafhfajqu5frfc3hrbrcmbb/91739985602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=makalah+limbah+b3+pdfPDF 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_off00013a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15286 18572 bytes
SHA-256: 0354af18b55e2cee9d4a732f281435459920d7816a2e3d5d51418e6d69e587ab
font_02_sfnt_off0001828e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1828E 10440 bytes
SHA-256: bee7b2d65561e9623668c11059a06050d8613f8ae6f444214010f1ac208aae90