Malicious PDF — malware analysis report

Static analysis result for SHA-256 800f00a981cb5332…

MALICIOUS

PDF

91.9 KB Created: 2021-06-29 06:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f7fc338aae62f8c4d73586d21dad38c SHA-1: d4c2f1bda5aeaf66c5c779342ab9fa8c2ea8a886 SHA-256: 800f00a981cb5332cb69a96d6ce658696b6372c727c78550a0ef6b69bce64f4d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of link farms on potentially compromised hosting suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/opsaepba24bb3jh88d28jcfsp2/jopalojorujemajuved.pdf In PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4790aef91a---9678053271.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/22752457212.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff56f2617---zupire.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/belinomolukuf.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce10e3e173---lederolebelirazol.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/eedf4cba2e1d7cd9003655c26ab53a2f/33381148355.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/farasezefeketenagorodipi.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/375k804eokt7c8ddhldb9os35b/65126414644.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3f148b179---31878874769.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/nejoxezowakale.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8398f16807---noravanamowefamog.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///73257386707.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/pc3uf8vvur597ntgk9s6m53ioa/76970592901.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cc1dd70037bbf7f127d560d6b5c420a6/19037187804.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4f44c8ce4faf8ca3746b2cadcf399225/90824462946.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/52654344051.pdfIn PDF document text
    • https://cncunse.com/d/files/mawezasokebumuripuzeras.pdfIn PDF document text
    • http://sivam.pl/files/file/fexikemesozaxi.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/xosutomewugaxibigogubu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8241b4a3d---wavizivunefala.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430140618323019.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608343b9ae6c3---22297870686.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c225e8af6c2c5ed4981d685d393eb409/pagopadudirebov.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4fcb64b49487326df47e8e67c62817a4/23543331436.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c50abf1d10d---manisamerulipazujubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=beautiful+fool+quotePDF 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_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 10136 bytes
SHA-256: 24a3cacf98ad95c1d3b9348c91981d93f828380d4b5611469dfb9b614f0c4020
font_01_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 17388 bytes
SHA-256: c90adc1975794bb3343b9901d858c9b2ef62f05da3424628185bc85d20098d30
font_02_sfnt_off000148f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1