Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a23e59905e5b7f2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 10:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89613b7494a784a138c7e1e529abf344 SHA-1: eebbbd98b81ab28c7edce397b7fbf5b32dc1e4d2 SHA-256: 3a23e59905e5b7f2e3548e5c3f3324114ef8208768ea8d0e3fc3a5fd43dd013c
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were explicitly extracted, the presence of numerous external URLs, many hosted on compromised or disposable domains, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=sweet+cash+loan+app+apk+download PDF link annotation
    • http://swiss-ex.com/images/blog/file/rawevofuvuwavelugab.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/desezabojidefefelo.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/budojew.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2e11fedbc20dc8dc45788f654693878a/vewapamijozomoxona.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/zusaset.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d40b69d11f19492d1b4b09e0fafd2a22/vumemidowumod.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/29924148513.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/sunonadovewiji.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/876154167.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/15354740234.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/rowewolabakidupujakaj.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/xasibuzeranoxi.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/70282977617.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/majirelikatoxuwumof.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/wosewerirorivogozojo.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4611096864.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jorisowoga.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/75230309285.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/zegige.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/93397570477.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/55933118131.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba1ac8b68---kezitupisoxebusigavevade.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141684dc6316---76339375044.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r2tedfe0s0h68o8mntso5slqf7/golubuligetugezilojovas.pdfIn PDF document text
    • 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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 17384 bytes
SHA-256: 4ebe09aea95ded59c637df07bd6e32d46ba196d9cd3fb16b80ed14a5ca2a4986
font_01_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 10672 bytes
SHA-256: 3aca530aefa2341077661002a8255cfd373a469b547f333d2b7fdb7f2b340604

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