Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a44d93c0d1eb949…

MALICIOUS

PDF

89.3 KB Created: 2021-07-20 22:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a827a2f18c91b177f47fa8e73cca05f3 SHA-1: ee3e2ca2aabac2c5c29a9076ea79b617e50e3bcb SHA-256: 0a44d93c0d1eb9490efd8816e8ec9c364cfc18acfff35ccf01dc150e87ecaa22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate that the PDF acts as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083efe7b83ae---bagetevujolomemoloneju.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/76527469246.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/58755875087.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/26101939178.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869d0fc8b14---mufuva.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6pvgupt7gs4jmnoaor1ecveqg5/95577489722.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c27cc89899a4e55751a47802d4e96f4f/82976001079.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/20104851520.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/64d7a384055d78243af8ee39a8b27968/20992423434.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f5d9d319e310b4d7ceae955ee64d2e1d/55129285269.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00565c7344---lugaral.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e8e0add344ed0e8d072ad4572568f5f2/61768791745.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210613230504.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kmq10hvk9vbbsadf573m8o3clj/vajiferesemadusalesuka.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d2bab6e6170f549aafb73d222a709091/94730177092.pdfIn PDF document text
    • https://lapakunited.com/contents//files/noduweputivobaweso.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072054c98e7e---44002411427.pdfIn PDF document text
    • http://dothi.info/images/files/49349030011.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8cd97a34bc2459266db68e3e620f5cde/31991270042.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084702db8dba---saxoget.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/nefudu.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/danurowikugewixarituwimeb.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/60303725979.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/66f5847660bd1fc54ad7d0e2cb8b99c9/guranowewuneraku.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/125fc7555a7540a9f6ee1a675cc585df/gosiragesuzokafi.pdfIn PDF document text
    • http://%3Cimg%20src=%22https%3A//dx3cna.by.files.1drv.com/y4muRtXEZ8GU63KhCWU9K1pvXfMPrzwrpmZbHal7X8oL9UHiGtul6iNaZ6tTAWkInL2PMZXgNvL0Mkc_jDDFmSIexhOzueJ73qZiWaojh-In PDF document text
    • http://%3Cimg%20src=%22https%3A//dx0nka.by.files.1drv.com/y4mr74PunxrUvAQoC1XDA7zJ_Wimwxj6QdK63kYVQ-yJD7DhgMY9CXSoLI289nh8g7MkOqCs7qvC9I2PFwGcW3c3n__T1GzO0necj3T0sSwWkMhyZZ6YtLXqf8uVy1-QMGw7svUK50r31zOeQh5NjomlYfFdxUS7zxsdvlhPL6Dreo_sgCUD2u3Tfj6_ynpnyKX3HpyvqbbMMkqBrixkikxlgIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=assassin+creed+3+trainer+all+versionPDF 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_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 18340 bytes
SHA-256: 98dbcc07812c8d9aac37e01d9298aff4101ee9f525d312f9d4f8f8204238a128
font_02_sfnt_off00013f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6A 10584 bytes
SHA-256: ee972e8552ca9718b44d4569f42755273c733b0ac9a2819dd40a0570b30b2d5c

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