Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d14d6d50614283…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 23:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e97dd27b4288f3dd8f509e8ad68b9e9f SHA-1: f308b04ee67da31b3feb72fd35ceb389c5249c65 SHA-256: f4d14d6d506142831156d05437bfd6008d039add0b71d82f61877d4a14078af7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=mi+band+6+watchfaces PDF link annotation
    • https://bloomland.com/sites/bloomland.com/files/xiliv.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613968122fb48---15906524.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/18493699555.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/pnumr3hu6lb7gtnr49s2k818rh/31375484203.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/dejudiligalokosomesup.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/palubulujogajin.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210901153001_y0bifv.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/bozapuver.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/21245412830.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161397f16e4dee---51744454911.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/nazotazatadubut.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/95667223809.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/mevogifone.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/24533903529.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202194145212509.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/dufuj.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/97493805834.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/55612913739.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/40740933733.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/vuroseko.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210903144500.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/16427350602.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_off0000c914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 10696 bytes
SHA-256: 00f9355fd267fcafd8c15f389db7a866782bc93ebf41cc51bac633686224ba00
font_01_sfnt_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 17352 bytes
SHA-256: fca4b530217c94936d41bd9df127c8ba8e1e3dba38bc5e6ee2a458e115b20139
font_02_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1