Malicious PDF — malware analysis report

Static analysis result for SHA-256 8616e1e481eb0514…

MALICIOUS

PDF

96.5 KB Created: 2021-07-03 20:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4c0b884807a02027522a75d47521f0c6 SHA-1: 068250fe4f704c0a1163f670b1a002ba268a9f46 SHA-256: 8616e1e481eb0514cc39ae7583a4ee9a873082281fd4ef4d0dca228548fdedeb
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ume1kcvkshpfsftgk81h480fju/905756000.pdf In PDF document text
    • http://sbox-technology.com/upload/datoteke/pofupuwedomize.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bbc63f4e---78744164542.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb19998e5---38031105379.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c8159b320---loduziberijivuvig.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adc09cbbf72---zezosixemezoneku.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/28493e165a878948b63aa47b9cc812f7/fapubugofaxide.pdfIn PDF document text
    • http://jonme.net/ckupload/files/bamixolavaja.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/982d6b5a51a0fd0c773c002bf3094c10/19026704849.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/72517297753.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863753eeb45---dalodepozoxajasetuv.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b47f6024a---67852908886.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/xapudapalufepuwukeweman.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d6ea41314c34f68954befac30e131454/wekubikirobekir.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc9ad731d1---kujexo.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/tajamisusatuwivefon.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c5d41a10d---85232271813.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8503a8701c387b42bc05bf45417e563e/75241837570.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/goxugaxuluguwalafafop.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608373994f2bf---pezijijovawejimezimikaw.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/74593626581.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xukinatipakizen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=infographic+free+pptPDF 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_off00011a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13291 16516 bytes
SHA-256: 809fd63a864d65681686416497db1a64e5ac1e870698ddc1baaf2b83cc81751d
font_02_sfnt_off00015d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D66 10496 bytes
SHA-256: e9be125fa58066835d2be436262ec0dd205d45dbcff33065d07531396e3993e9

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