Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46a2bf0dd64b0a4…

MALICIOUS

PDF

85.1 KB Created: 2021-08-29 06:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2862be48fdbca55471f7ead538cbfdb4 SHA-1: d3a1afec94db1d0871a01b592cfc61987379a1fc SHA-256: a46a2bf0dd64b0a430a7ba78ed6dda8a20c7bf23bd4faf2a7ce85bb7e79256fd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thongthien.vn/upload/files/todudonixaroxo.pdf In PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089ccf12b31c---gagapipafedepebi.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/13677224767.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/41857978298.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8540779bd51e9cac0ad7aaa4164df814/43667315889.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33e155130---dokoriliresevirexufan.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/18742218875.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b4e458ba4bbe832d1ac6930ee5849d5/temewavukijizotepez.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/20729169146.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a76f331f8be---kubonetila.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dc80f76aa6b---92417168905.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/92389822167.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/76594657517.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/meludopesixer.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/boxazajamagepofulizusif.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddb205c76f---22766006702.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/66558662390.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160862b48e46be---53336804587.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/j5ajq3s96n4mboj0e693ffg6j1/lexanewoxibekorimaxorig.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/87h8pinp8r4q7tdg43tv0sjth7/zivotulozariwozoxigenu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/07f227c77dc2ea1708050c4d13bda848/46831210383.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/70296627370.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d151d404b24ffee907d2fc420c98da97/zajerukipinavagigemubasi.pdfIn PDF document text
    • https://southafricapools.com/contents/files/34806663396.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed5bbee45---89641763849.pdfIn PDF document text
    • http://candientushinko.com/images/file/nidususep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=smash+brawl+how+to+unlock+charactersPDF 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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 10896 bytes
SHA-256: f3550c016230e1e8f2df813a8e41c5fbe64d46bb3b926baf5085b4ae45c0384b
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 18672 bytes
SHA-256: 5fc298ae76ad7eb0578e7f4c55ccf5bd1bc0da6452c9242eba95223c0330a0c5
font_02_sfnt_off00012c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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