Malicious PDF — malware analysis report

Static analysis result for SHA-256 814de05d782b1307…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 02:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e1a4bf154c093e6f07f6bd11149c59ad SHA-1: b9bba80003584472d2bf15ba330e331c84b98688 SHA-256: 814de05d782b1307149f18b4b39bda556328b8acf6b18503ef341c0e94b87b0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb4e60e8e---wanupatedegov.pdf In PDF document text
    • http://mtecommerce.it/public/news/file/soxojunomuxesadu.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/wodebutesema.pdfIn PDF document text
    • http://szjg.hu/images/file/dutiduwamasipinuwax.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/1861580544.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5766732a---46603010087.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ff40a1fff40c1009df67a672a5681457/96482405693.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/osem2hfj96bqm162ms2ps0qnol/nutemetovaxowesodujiba.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/86154923222.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/jonexudokogetorosanap.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-9/20210509142059442220.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0e345b03---56485472133.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/nakevogejuj.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/03b7d28cbe4b858a68d63aa18feedb72/rexuxijagabudakizakodumuf.pdfIn PDF document text
    • http://artepcb.com/upload/files/sajalajewus.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ee87eb4d2d8---kapisamalaparejo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a891911d9e1---37466177209.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ar9dpr8i1dvhcov1lk6n6ilrc5/94176744080.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/jirunaxiz.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/tivekigufana.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/betax.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607936518f39d---40588747669.pdfIn PDF document text
    • https://bamor.org/userfiles/file/17823909204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=peran+kalsium+dalam+kontraksi+otot+pdfPDF 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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 17120 bytes
SHA-256: 7d43acf03826698b3ee7ca636882d6fa84e1d744dec1fa09255192029ce9ce63
font_01_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 10852 bytes
SHA-256: 17a7d82889f02620295c630d49871bc9a2efa29f2e8794bad6744a6e751b5916
font_02_sfnt_off00012fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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