Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce91babcd1ef88a…

MALICIOUS

PDF

68.8 KB Created: 2021-09-15 09:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 374b6866ffd0b02f2ea9871669880193 SHA-1: 5508671a1b9fce7c1c8ecc8e3ec39b44b121b544 SHA-256: bce91babcd1ef88ad3af412a238945e2f59915411d3aacf6468c8b5b3018f47d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document designed to trick users into clicking an embedded action trigger. Multiple heuristics point to the document containing a link farm, with several URLs hosted on compromised CMS upload storage or disposable domains, suggesting an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://garglob.ru/uplcv?utm_term=worlds+hardest+game+apk PDF link annotation
    • http://www.mostenpo.jp/userfiles/files/21289198940.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/mipoxozejejapedij.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/13511523387.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/62434713472.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/nisarureni.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/xotomeritexixelubusog.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/43728645011.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/zinevesagosapizelekimutu.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/9017204319.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/ligikakelabunidajifanufu.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/80481075558.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/44171405148.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/47316859081.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/81184083280.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130811514d73---bulidedosebotidujaj.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/16117075190.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dg6c0phonk4u8cj2oqdohlo7f4/xejanusefudomesoluluzew.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/losagazupuwi.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/senakusipolapujejawizafut.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/9432186772.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/8314985080.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/90918071846.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/19832534868.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/99223622177.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/8251243271.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/63663126175.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6dfdf1adc---38581317869.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_off0000b2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 10728 bytes
SHA-256: 3567b214079ed0910da98849e96bc1e14bf125ec8b67d9fa6d5d2e40e77699f4
font_02_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 13880 bytes
SHA-256: a8db17f29fdc16b986661b7884080e822153bac59915a74ead92bba4bf283633

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