Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6ce275702d0683…

MALICIOUS

PDF

86.4 KB Created: 2021-07-07 01:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0924fe8886d612c4a0daac603b856ca SHA-1: 1196924b9dc480d9cfc046a3c19df1c5fa929fb7 SHA-256: dc6ce275702d06838ff08841409606cdd4421eb830e5eee2685c60bd88a710fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0f631a42890b1cbcbb31b0d96a814b7e/39676651178.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098439cd05f1---9801491088.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/42m618m5os45qsvvqfvtf3h8qd/fazuxi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3c972966---komirusazomus.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/munilukurojigezedalijisuk.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fc0dc47c---luvifodifufu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/33438507434.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/22853050330.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a753917f074---moxakawilavegejuwu.pdfIn PDF document text
    • http://servmed.net/userfiles/file/88542706055.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210525032520.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/krc5glc77avdi60naf7i0uj7p6/70507067202.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/733cab4fe9a87f5a5596ee5ec7afd4fa/serisejuxenukolokokukab.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f31c33c0a4---12809592898.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/ganuloziweriminadedawu.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/62510115465.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/20e81a26ccb401f1f9039374ace0835c/lutezuzonezudivunufisar.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/rorekuwopojobuvakolisa.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2177c982b---27750369022.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6ffe757db3d9294508b86d85d73b092/jakimaxunaxovokurezima.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/golejokeduwisoxulizuze.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/7e6cfb9bf68076e13e011473c9c162af/gibuzosebuxofirut.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/60978248b4cd10ebb05174ce22b05271/ripimegajokurizegevu.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/majikareponirodero.pdfIn PDF document text
    • http://islandpointfl.com/userimages/kigoliredilaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=network+hardware+in+computer+networksPDF 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_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 17108 bytes
SHA-256: 4b2e5cb5664288bfbcaada618b94a7826c5f37bf5178a27ea7182f716843dd50
font_01_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 10988 bytes
SHA-256: 527fa1fcef430be4f2f8a1d6b749b16450c7f13847f0b60c047114da63ff4c91
font_02_sfnt_off0001344b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1