Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8340f9d35b1fedb…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 02:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 699d84ffc416dd9d60789fed9e1aedc4 SHA-1: 45abcb39d6ef4a44d28aa160453d72a8bee7ac96 SHA-256: e8340f9d35b1fedb98202b002b74336bb7abd11cd3879409c6699aaf0a3b660b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document intended to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cremyco.com/app/webroot/docs/file/fiziderefinidelixosoto.pdf In PDF document text
    • https://alutat.com/data/file/67840631887.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b5355a455a2---85048848605.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/xukolu.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/mawuvudaboku.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/7410160774.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/40837563349.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/14876504727.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/79707815456.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vr7dg9elppkhamokj1qkka6c3j/5789298472.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/65718bf3842f7f3d77f2224d147183ee/66259347527.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210705205332_thhhsz.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/88280516354.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703362d811c---54937125545.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/104f104ff8aa5cc8de473738dd117c07/59105703732.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210814192122.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3689e132407088d2f3e54b6751891157/29899289413.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/ritelajesediro.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r6gantt0dca491vin3qh1iqlv1/29945791090.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/18720690181.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99266dfd3962a02aedbd85b12ae431c2/40820445563.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/61457664969.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/wodavutelopisuno.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/rilimadov.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/duzukukutidezinotolav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=one+rank+one+pension+calculation+table+2015+pdfPDF 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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 17692 bytes
SHA-256: d3ae8256dfa055f8afc119cbfb028f0d50858e9d5a47c2f42f33997416c1eeb3
font_01_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 11396 bytes
SHA-256: ee39158d9e34d617d5b7a85c3d8e59c4e7939a10b519c3c1f293f8c946a3d125

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