Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bc1cf6c190b3f6…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 18:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5635be4a3addcad1f34c02e3015caa6b SHA-1: 44dfc301196935efc26b7a6859b3a14654d8b3b5 SHA-256: c9bc1cf6c190b3f67c57bba5895cb31904faabf1ac0b36c912268d6143f067ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, with several heuristics indicating these are part of a link farm hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://lejonhund.com/upload/bekibuxipob.pdf In PDF document text
    • http://dpsszczytno.pl/photo/file/dijixuzaxaki.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/61979178463.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/6745071533.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614825bbbcfa3---deforikod.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/jufazasezalotojagi.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/nixelusujuvezekif.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109140634457795.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/denav.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/lapusivepufed.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/sefotapax.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/61815463770.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/87134478558.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/37251289596.pdfIn PDF document text
    • https://southafricapools.com/contents/files/zujawaj.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/57560853112.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444b0dc6caf---jivotepodefilitowira.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/70492effbc8da3d11e34b36942a5cf34/xasonumugosaxalivame.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/rusodumojaxule.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/16175374876.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/6862450413.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/tijurimisegitib.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/21680163442.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/pizadixalavotobureg.pdfIn PDF document text
    • https://music-group-store.com/upload/files/33414327882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=work+365+loginPDF link annotation
    • 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_off0000bf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9C 17476 bytes
SHA-256: 0524a30db301436574ecc6618cebe8766aa0e364530136157c632e3cce56de36
font_01_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 10280 bytes
SHA-256: f11c81994d548a1f2d2910bb98a1e77184b8b5e612494e2f9a87ac0bbcd0cedd
font_02_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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