Malicious PDF — malware analysis report

Static analysis result for SHA-256 898f416ed5e31f96…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 00:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63dfee68821391fd04e1c12eb064c7f5 SHA-1: 967bb1b21b96668f723db8d2cd711a08f3280eff SHA-256: 898f416ed5e31f96aac237fb06e1fb2ccd9ef4ef56cc473eeca1ea9d5201d6b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=fit+apk+download PDF link annotation
    • http://tageedesign.com/ssmpt/documents/file/zerevik.pdfIn PDF document text
    • http://fructusartis.com/i/File/julig.pdfIn PDF document text
    • http://gabortech.com/admin/file/42745839409.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/3669401880.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc0a94e680---73105086305.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/14073124042.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/rovigadexap.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/29932558104.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/15411793284.pdfIn PDF document text
    • http://mobiliteit.nu/files/kibonu.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/gubezifulananifogewaz.pdfIn PDF document text
    • https://ekransamara.ru/files/kopak.pdfIn PDF document text
    • http://boldogelet.hu/media/woxifetadoniwokovijuso.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/vitomululideg.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613496c931253---76425769163.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/nuxukojile.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/18410267971.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7495edf51---tijax.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/tibinofapa.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/jeleduxokow.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/14059778098.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/51819861920.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/5669233512.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b2c2a3f1b99a64d1f4acee8682eec644/5391048929.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c53875b23---34998989247.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/losepuguporobafaxoruvemiw.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_off0000b464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB464 18288 bytes
SHA-256: b9424098166eb275e88cc3f31a4ae51754f8c47ae4421503b4da86bcec0e0a3f
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 10140 bytes
SHA-256: 688a48d5d3b7a55dd5561719c564c71224848045a820cdb8e3c29cfcadce5c7d
font_02_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1