Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cede2b9e76d7772…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 08:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bee7fa893dec228687376cf7fd1032f8 SHA-1: a85305a13a2054e178cc309a1de8f60c66dd102e SHA-256: 8cede2b9e76d77723841acd74e237bd7891b7cf8403ef12262f65e0bd8f1133d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. Heuristics and ML classification strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The primary function appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf9693a10e4e88fb24ef3d06c87d18d8/27896457599.pdf In PDF document text
    • http://ever-pioneer.com/upload/files/savunuwamigudigixoriremu.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/xuvovirabipuzenewobusa.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/tomaz.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/regigawavubupuzewebixapi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f7636451d---kasanogi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/25b84fb965788555ebf70b37f999b7f8/zabato.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/surudamekaxi.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/safevota.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/43681490622.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/851d35237c26a7a7f19253787f9125c9/xupegegowekimot.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/laxokazuvuxabuwur.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/penar.pdfIn PDF document text
    • http://mlead.net/images/e/file/fujakuvenonizomuni.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d4e1b098---fosavugosagod.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/73138994725.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/26004223384.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/91533516192.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/pawuniporavejetujatulir.pdfIn PDF document text
    • http://ukrfirework.com/images/file/gatukafitu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f51d0e09---xixekofo.pdfIn PDF document text
    • http://premo.at/userfiles/file/96868072338.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/99835883177.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/fumafasizidedenexakifa.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/davupopujoxatukosemijuvok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ag+injector+apk+downloadPDF 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_off0000c349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC349 17424 bytes
SHA-256: 3030a8ae0cdaedf5549c7a9de60d0e0dbe655ab3a6c7c6d659ba3ad04f951493
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 10812 bytes
SHA-256: ecb71f03b58ce4d2023306971b3bed81c4d8cbf4fa1ef2ac367488c7788e0a99
font_02_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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