Malicious PDF — malware analysis report

Static analysis result for SHA-256 431c57a77c0b6a7e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 11:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3957f03eff068a83c7988eb5edecea1c SHA-1: 4fbc40ff01b20c99e0f83c56725d28fddb95f9bc SHA-256: 431c57a77c0b6a7ee479af4c713c752afcda2c6d7cd606dab25dca4653afbba6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document's structure and embedded links strongly suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tantusmarina.com/UserFiles/file/rulaxejefefesijitizafa.pdf In PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/lotupibus.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/36610965788.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/75468108696.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/6ee0k0kvndrvgna0k29ntg3d93/fumenujuwotibafatemexutem.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/3954446739.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qvu91vp7bq2dohmb5am0lmlqgt/sakamarowokuzar.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/8f07fde475ad7976eaa555c821454ac9/62646193904.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/15203028981.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kc5qfu3opg1rvdncv1l7v6456v/sorizovugokuninekulag.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f3c22760---80080754758.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/52694761802.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210610_105356.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051112295463.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/94698975835.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099b821df876---43423396335.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/78546484813.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210515211925.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/427451425.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/l0rfilq1kmas5n0g64v8j06bd6/10064578142.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/95430530673.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64892905e---bokagosam.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/eda21bed95912e601bc1ccfd3663817d/35837106046.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nibolimuzorutuxalo.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/punivuwoxipefopalosaxira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bsc+1st+year+physics+booksPDF 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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 10772 bytes
SHA-256: 292c51ed983723589d6e9f887538dc7f4c5b3a9f71f34ae7640f2e962ee38603
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 18128 bytes
SHA-256: 5d64f1f6ed4964379aa25057ec0421dc9e604aa2ba6ad2328f565bf95d859f99
font_02_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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