Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc41f456641bbb3…

MALICIOUS

PDF

83.2 KB Created: 2021-07-09 17:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 649517805cc148a954b0a36b10c1c1d2 SHA-1: c505663588fe30fd49c29141ab76d20f4f975b41 SHA-256: dcc41f456641bbb3ff172cd0d2389920bc3ce75790c4b572369f125781827207
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded links pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF_RANDOM_URL_LINK heuristic specifically highlights a link to a suspicious PDF file, indicating a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90943b604---87895793481.pdf In PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/45g8ng0afp5gj8qe26oin4ott3/65222160874.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/30680436750.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608082e73a816---76787222647.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0v8cc2i76pu5tl8q70mpcsdb77/rojujuneruwowazubigimi.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/sevogodazuxedexorikarupav.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fd5f1c9fd44e7ca8647ef0d6bafd99cc/98634255015.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/jibej.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ecbb2aa29---51496457942.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5902bd6773---dukaxojeketidon.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12345f803---duxufovanawabejonowegiz.pdfIn PDF document text
    • http://rykatd.com/files/52570519745.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ef8ce0bf97184ecc8e04f8a087033855/suviwa.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/405cafef916e6646a62f2ca57825b7d6/wununeke.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/mevaxi.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/37202096280.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c99393eb5---tajibijedidasosije.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2fbace6c---vefaz.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/gemiwatasujodevesubizad.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/tuluminavoni.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be02abc73c2---jotonujiburovevutezowem.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cb44d622f---gafulufoliromapizuzeve.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5110e749f2caeadae434cd0a30c73150/sitizosazuviwurewefuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=icd+code+for+seizuresPDF 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_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 16588 bytes
SHA-256: c60ef1064a4aa22d107492e12dc3aeb928445405de9c833991c8fe06882687bf
font_01_sfnt_off000110d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 10168 bytes
SHA-256: a3a50376dafb51decde2c55abdc514bed5802344f5c0ae7d92043271c2a26a19
font_02_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1