Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78c64a9d7e1ea2a…

MALICIOUS

PDF

82.8 KB Created: 2021-08-21 00:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc66112d17ba6628f569295e519a2404 SHA-1: edcf2530c48b4e13cadaec81f3f3998fd5e69bff SHA-256: e78c64a9d7e1ea2a8b1a2ab6acec8af9f73384ceb81989d02002377e567e9e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware delivery document. The numerous extracted URLs, many hosted on compromised CMS platforms or disposable domains, suggest a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/uplcv?utm_term=simple+investment+agreement+format+india PDF link annotation
    • http://sosnovgeo.ru/userfiles/file/ruguzubaxur.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27a7b26301---bowajidilujaxafe.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/nisoromekozuvedi.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/gamosakowezemekatawene.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d53ac7b2771---83323601240.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/diwediwurev.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/tapudavilexiseniniziw.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210815071902.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b19475a3dd1---kizupijuvuzezelafov.pdfIn PDF document text
    • https://digireg.si/upload/kefatugobapetoveviso.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/75429114582.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pougf5l2m16v4q52s5ijir00v3/88431137553.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/kizamonudadefigovuf.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcc8c05271---vedalusidawuji.pdfIn PDF document text
    • https://bloomeng.com/uploads/devokiropalunojijosukamaz.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adabcf58498---47325889923.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c7aa4f7b---sobirikilolirak.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c3f7555f8---lakewali.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/557fc5ecb779ab0ff0d7ca845407edaf/kuzezinev.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/vufizi.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d679d486d2---93335217577.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_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 16472 bytes
SHA-256: 2c0791e89b18098ca83ed64ea10cdab8df1d3ae69963fa7ec3960eb8f64e4865
font_01_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 10984 bytes
SHA-256: 244f7db9d00c03dfb99cfb89fd2121e174283b45ae7e01291d5e935a8a19865a
font_02_sfnt_off00012528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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