Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e4c04e4cda7461…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 14:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d6083617d8d3a94c085e0f15f34da618 SHA-1: a177b28eb80a2c9de63e987fc28a33478a749eb9 SHA-256: 50e4c04e4cda7461052d3636bc4b1a4ce34c3e16c5699217179e8a5dcb179b78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous links to external sites, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to use the document as a link farm, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=download+badland+brawl PDF link annotation
    • https://hophamthaibinh.com/upload/files/sebiwiwuvilod.pdfIn PDF document text
    • http://birdwatching.sk/media/file/koparuvotolupufu.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/86829465148.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/dinovifukowojobibisebexep.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d7ed90ac---6113326169.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/fulunebolix.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bdf2hufrurs95vn1st961ts144/57109218123.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/vevuruvowukozisamikuli.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/93116011428.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/97604516493.pdfIn PDF document text
    • https://krossi.ru/images/content/files/67135902776.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/begukinebebawadi.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192321862580.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/jezamusarumebutofud.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614fef9d877ee---korazowabezix.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/lilididojemimowakab.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb4249526---44575351158.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/99496779807.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/lasapifawidojagixupaz.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210912_117EE86DA948105A.pdfIn PDF document text
    • https://andrejc.si/files/file/zunekelulasuxud.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puvigutipowotovusekoz.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7737973160.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/33026913202.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_off0000b450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB450 16036 bytes
SHA-256: 0a83675d1b6ef17645e83ea8d567447c7ab93b2046f05cbea7b4c395d272f840
font_01_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 9976 bytes
SHA-256: 3af9cbc25af409a555d2b3ee20f5ead5e754e99bdd34dcf7e5e2e986ee2d41cf
font_02_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1