Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec26c93047728e10…

MALICIOUS

PDF

78.5 KB Created: 2021-09-15 16:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7ba07c859bd8d7660a70d180bb310cb SHA-1: 0c7f994cf5404c586c82e904e5dc6c00a6e9409d SHA-256: ec26c93047728e10c9ed442e5c8645dbbae817d71e6e090bbda46673a62b30f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware download pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kingyao.com/uploadfiles/files/20210909_170301_6162.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161404ed088f1d---pigijavuganitama.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c090255b---fapolif.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/roxaganexi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093eb06f9b---73875989419.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zirifas.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/53357355029.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/temekoboj.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/41319040062.pdfIn PDF document text
    • http://maxbrio.kr/files/files/venizifebefodekuvazem.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/potatagokavigupemikape.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/galenalipotufekofafilaj.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/dumogozitu.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/53609646811.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/93782427924.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/73385469180.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/vegak.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/54410463539.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/71683442924.pdfIn PDF document text
    • http://domainecomps.com/documents/files/mumajolumexinozi.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/zavoxezuvawamajelezeka.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/5767748425.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/wapogoze.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/11520955394.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/xerepokawitopofisajo.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/66515215389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=touhou+cannonball+apkPDF 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_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 20092 bytes
SHA-256: be26366a93f1af1ab2cce1a6a4b320627a709410741cc4369a15898da1089ddd
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10176 bytes
SHA-256: 9c56de5143bc28ef71d1fe9641f94fc6fc11a17e0f31e6403d50537e79c453a4
font_02_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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