Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c70769a289aa28c…

MALICIOUS

PDF

90.2 KB Created: 2021-09-09 09:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d2ed6aa20055eb7099e052e78547e31 SHA-1: d7db4f7a535cbac3544cf4bfa2415f35c223b811 SHA-256: 3c70769a289aa28c209895a56b5af86b3e08fe02e07afa59f58d98037ae6421b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://veszpremlizards.hu/_user/file/suzulup.pdf In PDF document text
    • http://zkpower.net/upload/files/lovuzanoxumunajixujizal.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/88575978558.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jexivufujuruwota.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373104c62e7---divadatebumopomav.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/makugisiz.pdfIn PDF document text
    • http://momsystem.ru/public/file/86601564425.pdfIn PDF document text
    • https://temahr.hr/files/salorigize.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/14f1s2l96msi8m7a1f0dl9n62d/15285600703.pdfIn PDF document text
    • http://stl-hk.net/userfiles/9422363647.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210901_09510214660551DC.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/80188245896.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/47702474831.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210908155412.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/tenoxelikaxux.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zuloju.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/vesumuxinukobaburobagav.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/59683576066.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/ranabit.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b148332fb---50479868829.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/74888648094.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/mezotegir.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/89567236902.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/rujexuzomokekagaba.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/35736636152.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6fb2s66ht5bh46rq1nvebpfuu0/kawufoxijivupufos.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/gupiwupol.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/77961889284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wifi+texting+androidPDF 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_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 10412 bytes
SHA-256: fd7debdf5b68aef026037dc7c44442cf35a22522adf476e4ef412a897e73cd92
font_01_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 17940 bytes
SHA-256: 2256db5760e52f950cccb8853d7cff411936be9423443c68bc261f593744f973
font_02_sfnt_off000142d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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