Malicious PDF — malware analysis report

Static analysis result for SHA-256 e959e89162bd68a8…

MALICIOUS

PDF

84.3 KB Created: 2021-08-29 19:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17d35387bd530b24af33ef50a5d8a09e SHA-1: 8c536154935490fc0a94e1d30069730b642b3be3 SHA-256: e959e89162bd68a835b7e4ae27be7a16c5358266a9ec9748865c3cf335200bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/fr63lsku08io7100r1ldchfvsb/22390017627.pdf In PDF document text
    • https://groupburuemas1.com/contents//files/38172302669.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc2a03e95---855405032.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf4c75cad8---83955881798.pdfIn PDF document text
    • http://belovosushi.ru/files/tizumomogurox.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/37367367977.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/30274ac1d8febb3657e4b44fada036ca/lujeparefuzamegapovo.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/zagojusowuralumatugumufo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7771dda1ceadcde9d5fc305e7410830e/bowekizumibajazokovovite.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/17720342826.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3e6c82be---fepujarefumikorefofurazew.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/woxumerafen.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/56104529454.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kiwixidakuviwigi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a98bbf26054---32247839104.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/30160472009.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/54930282557.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c397bb0cc81---20636629935.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/xisigifubugegirim.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/razulafemobikarotik.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7af65e054974236e06789c016efdfda9/luwetorar.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/a3f81be9d2fef74b81abdd06d9a56d36/zowebupi.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/lugelud.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/wuwidadajezaxudibokalaxov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=leed+green+associate+study+guide+pdf+free+downloadPDF 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_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 18696 bytes
SHA-256: dd38583c9707ee1aaf11c958a45762e904042ac9f9c9a97ca8d9d904c7c3c5bc
font_01_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 11052 bytes
SHA-256: 9949af27be9ad7091b57b1df5bf3df8e0d87fcfed9fdc58383693f5794eb5da7
font_02_sfnt_off0001287b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1