Malicious PDF — malware analysis report

Static analysis result for SHA-256 634509ac0e695219…

MALICIOUS

PDF

71.0 KB Created: 2021-09-12 15:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0ade2858d77997b8a1e81a7dcbc4a66 SHA-1: 8793f9dc4f264b64097d49e1c91493845040b0bc SHA-256: 634509ac0e695219a439c69440ee59740dae432105d0b6b7f84254f035ddaa1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=download+crash+bandicoot+3+warped PDF link annotation
    • https://alebusph.centralcms.cloud/galeria/files/93206448707.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/c2dtmpev067fr6v30dgohe54vi/maboferadaw.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c1784ecf55019508300524ad72f3fa37/borunofo.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/rojumatixejoke.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/56543486774.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/bobawavejoxavirotobexija.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/16199900069.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210912_A16EF6F8F23B459D.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/jarukalitatovizetaxixuvi.pdfIn PDF document text
    • http://dentistturkey.com/image/files/bogofinokowoxigir.pdfIn PDF document text
    • https://camphacement.vn/upload/files/zopuse.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134740f3f4f3---10537868331.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/59686279368.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/vupawesareg.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/70212391038.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/gilipawonixezik.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467f8a928a---depip.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/85771835400.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/51428527293.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/mekogogo.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/29711860552.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/92860320294.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e4d3316b---39467275000.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 11008 bytes
SHA-256: 077ff0e0122d1271f05b5395abf6ba337d767472fdbe8e32a878621b05983703
font_01_sfnt_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 15468 bytes
SHA-256: 6a1d6c7ffed819f3ada88f10b54295c5c71f9e66001b1f2bcf1870d4d56317d5

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