Malicious PDF — malware analysis report

Static analysis result for SHA-256 709a3ba30a1a0955…

MALICIOUS

PDF

93.0 KB Created: 2021-06-29 14:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b1e26887cc43fc8e89e07395916bf4ef SHA-1: a99a68903982da8e8a3f5341a3c559dca6c14160 SHA-256: 709a3ba30a1a0955107bcfe191b27566975e4f941fde2c5f8bc2131fdffc59f9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a malicious link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS upload storage. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=the+entropy+system PDF link annotation
    • http://a-kamen.com/userfiles/file/vuxadajematidawekade.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/jobamuxumezod.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe2bb3cfb---44570392711.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/95029316783.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/91636842255.pdfIn PDF document text
    • http://slsnn.ru/content/files/jazalokuwuwa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a9683cd56fc---fadewuzu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3db5df1198---96205837144.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/45a738a2f3a45019ea5e311e0627cee3/87791548377.pdfIn PDF document text
    • http://isvpro.com/custom/files/tapez.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/kadanelivetefuvojazofo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d426c385f---wejizomitananeg.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a7a2073b---sezugil.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/57b26bbe689bcce87e5550d43530929a/zejariluzilaxelas.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160859a786d9f1---53262878943.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d438c9b6---roxozusofagamuwepebiles.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e1d20246bbce167142b828be59cf2c0/lolugesivoduvovax.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988fd8ad2da---97591275950.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f73ea1d0d6---pabititen.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7c4e442c---74852616528.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e42dc74c40---sijitogel.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074b18891e40---1573623958.pdfIn PDF document text
    • https://kham.vn/userfiles/file/29585078795.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607858bca1234---visukerifu.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/tawidusivujisijitupe.pdfIn PDF document text
    • 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_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 10292 bytes
SHA-256: 50923121088e485385681dcb01b1282acb923bf704c81dfbed0fb9e031c2c355
font_01_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380C 17308 bytes
SHA-256: 99e6d46a5a1145bd2c81c37fbc46c13b6d0435865637329eab1b1dbc2a5338d8

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