Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8f2895dcc15010…

MALICIOUS

PDF

88.2 KB Created: 2021-07-01 09:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: de3c41edb0778d5c9aaf2fc9578628ea SHA-1: d765637387dd729d940207604cb32ba4969c9066 SHA-256: 4f8f2895dcc15010ee08567f8bbbc24a17ac56f85b3694a4da99d83aa852e321
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these compromised sites for link farming. ClamAV detection and ML classification strongly suggest malicious intent, likely to lure users to malicious content or phishing sites.

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a4c2bc0c8---14031373752.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12285b020---14176473401.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8332a78cad---27467400736.pdfIn PDF document text
    • http://atrsara.ir/resource/files/gavijudirasununudovefo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h19ea3p39nbms14f0ipa6e7g8u/22507068930.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/90457699003.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/30165666574.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/17f8422c44427664b79813d06f72b87a/8050715582.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0544b9114---91633851289.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/kudirisotu.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021052319380429.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad6b3aea0---57359797848.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799fcccfce1---28615190439.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6c3phbcjur1vg7q73kikupp673/25738700358.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/78222807318.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9ea175a96fd3b82097f138ecc7e29b6b/dexowegapiviparobe.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/jolenutokekuwutamuwapajaw.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d41ed5d3---kagufevosoxapujowuzexem.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/mowagavemamin.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/79c814bd5a8c7611c0915de2b27d3d81/jivaxoba.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/kotebujulugesatejatiz.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/lfafc1t56s2be4ovic3m1khdu6/92866778216.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/96817475126.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/16480852682.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085946303fdb---72065869497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pictures+to+write+about+elementaryPDF 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_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 10832 bytes
SHA-256: 6d2fcb4f502de0a579414912f48cee7bc51670dac59bb722c00eabd1f4620f02
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 17288 bytes
SHA-256: f2bd09d271f432f6939a19bc4026fb3132be0760c0bef5ecae5688656c55b9e7

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