Malicious PDF — malware analysis report

Static analysis result for SHA-256 913ce2bf21e34c83…

MALICIOUS

PDF

105.1 KB Created: 2021-09-06 16:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46e407e8c9dead7e128a9170694956f2 SHA-1: 49f3371b6b4079fcc2a0d84d22494ec0f663b3c6 SHA-256: 913ce2bf21e34c831c8eda89fd13e1ed77c4fa444e1d84f1338e12133c2f3490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites, likely intended to redirect users to phishing or malware distribution pages. The presence of numerous external URIs and link farm indicators suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=neoliberalismo+y+la+educacion+en+mexico+pdf PDF link annotation
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0acd7c24015e5e8c5c0f59d5dcf79641/bozogopovuvefe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082912b55aaa---pobesevutomosulerisojufat.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/92700284207.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e1713c160---fejagojil.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/23782281770.pdfIn PDF document text
    • https://foulardfotografando.it/file/82058129131.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/sanuveralajoz.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/85b9405930a52dc5e9da6389a0bf3021/tajilipirunibelifewerexa.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1fd1ef42d---55845213466.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/wuvamorimopewudu.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/98234816956.pdfIn PDF document text
    • http://df-2.de/images/daten/file/13523460385.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f662a7937f---javavulexavatixisurisefaj.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/23438955692.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/fotofabiduvak.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4254184d2ab45c7ac92bc23ba8bfb7bb/buzizanakezare.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/pisijilemej.pdfIn PDF document text
    • https://go2germany.ru/files/file/muxej.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/52444031432.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/fipomivajuxomukofuw.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/galuxukifutemunek.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_off00013630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13630 18692 bytes
SHA-256: 7737df9ac8ba4ff90b0e17b7ab4d7252efcdc38f3d77e1ef746d5e1d3d71c4c5
font_01_sfnt_off0001655f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D76 11116 bytes
SHA-256: 95c57b5917a16e859dd28997ef4affa703eb9bd9232b4be1121a5d33fff541e2

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