Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef3c66321da887e…

MALICIOUS

PDF

88.8 KB Created: 2021-09-17 19:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: faa5ecd25bd003c9c916d6550885fa79 SHA-1: 3c3dc07055da88c1ccf5772d70d9863bd9f07271 SHA-256: 7ef3c66321da887e1a603ec84a0b82174af98fe81cf55759f2c451fab7a14a62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve to distribute further malicious content or lead to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b804210c0a---mawoxixedenizowewiniwiku.pdf In PDF document text
    • http://penzionriverside.cz/files/file/45484101562.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/26998411836.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2167820a9---rusiwesodujeke.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/40676939355.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/89617402983.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336d5e0640f---55915464816.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3a888ea0---1501358617.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137cde08356f---30098409639.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/wudutipulisozerupase.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/suluxinebazi.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/48136520696.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/97751814366.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/zubitibotanu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/58089465205.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/teperipalobobujuvu.pdfIn PDF document text
    • http://tykhchem.com/upload/files/8731710469.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/vunakefowipavumib.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab768ed768adc0d5c5d45baa528511f8/tedamopixobawogidofe.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/nosepi.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/rowiwenakajozegemazi.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/75870114947.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/lezeposonizipiduxo.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/luriwomikolitogalefo.pdfIn PDF document text
    • https://coil.hk/upload/files/fejixovulojo.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/17909217075.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210914_EFD0A315E42DF88D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=screen+recording+on+my+phonePDF 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_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 10676 bytes
SHA-256: a95f3ebe0f16e0297966b43b3a2c2477aee3e8197cabb61dd9594e7e331a2c02
font_01_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 17964 bytes
SHA-256: 5dadead144e52a0882a14ec4675753ab373821aa165c0270d72df6310ef6fede
font_02_sfnt_off00013d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1