Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de56e75b13dca2a…

MALICIOUS

PDF

89.8 KB Created: 2021-07-26 22:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b03f55d6624ef9bc27e7a3ca09095e61 SHA-1: 57838f533fbef1ca739102e79b064705ac13d028 SHA-256: 9de56e75b13dca2a75b923341158d9845fbda94e366c638139acdbd67d3a3889
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://optimuselearningschool.com/learning/site/images/uploadfiles/gemisuvafewit.pdf In PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/af0b1d4811b76c60ebb071d77d7de3e2/9521682979.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/suxarijaxi.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/wazotutifidemonu.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/tutidegofipadedelonafulu.pdfIn PDF document text
    • http://asustainable.com/global/file/wuxojolomubiferukadoj.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/fujul.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/10998384457.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/43086337251.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/p3vvui6gilbh6ija32rvs0q0vf/92707964082.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9a3d398ec---xegemevarusu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7dcaf69a---62145348467.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/8298f03a3d5c41809a7c8dc11b298d80/loresazofigijanewo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6289da9fcaa6e2da731d58ddcc7d90d9/zubokifokuxemenuwuk.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/bmratdr49etmbf01vhf224amtq/89666293985.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5736156c1c8855220d189849e2a1fc68/gijibuzatifatabalo.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/depoveriweru.pdfIn PDF document text
    • http://debden.org/userfiles/file/zumanaxaruduzowej.pdfIn PDF document text
    • http://regmac.net/userfiles/files/13678428991.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/lesosezemoruwozizulafubuf.pdfIn PDF document text
    • http://splogservice.ru/content/file/pamimemulenodixogukenob.pdfIn PDF document text
    • http://inncredel.com/uploads/97633831788.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5cd6d3a5d---20818194911.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/19707481204.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/44s09i8jiguv03k8or2cctef58/12192177347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fabula+de+esopo+a+cigarra+e+a+formigaPDF 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_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 20936 bytes
SHA-256: 5000b343e20d92ee981f831d8afead69ad8794c9e4362810a8f4adbe963e411b
font_01_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 10980 bytes
SHA-256: 31802e3f2d3fb197a5901b8217a8397831879339f5e4dac8148a9980ba7afeb4
font_02_sfnt_off00013f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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