Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12b145d1778c935…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 19:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb98f8c31f46e451587ce814cf9fd10f SHA-1: 41a9f32e26f347d1117ca46b8ae589d29ab6b2c8 SHA-256: d12b145d1778c93541d05cf1684d25b0e2a6c06a86a4cff4a2513c612dd9177e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used to obscure the ultimate destination. The presence of 'meterpreter payload pdf' in one URL suggests a potential payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://gites-les-bardots.com/userfiles/file/ziporizijonisanakegepizav.pdf In PDF document text
    • http://lscapital.it/images/file/11295533202.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/tameg.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/16/file/toreburejitakoviwefo.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/wodabebes.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/25384575202.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825c6ca839e---retexubuvejudeditapo.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/616ff12f668ed257e9f74daf641e6613/gazajelapowegapetewib.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/rutupevoninuwigimonesaga.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160908e7e4d3db---potugafatarowapot.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e55b96f7e67be89639174c8319699043/46112028784.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/22953973716.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/dff517df80a1ab178347904484d91dee/sobipapelakudevofokopoj.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e7f0ff9acbdda0a309a0125fe1af0dc3/ratumizixin.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/tomedizineb.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/cba316c9cf31ba971294e6f7ce91199c/16106986768.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee74ebe46---65804079997.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/xerobebimobikukin.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081754bf4f---27293985499.pdfIn PDF document text
    • https://digireg.com/upload/nubasavaxazitulabek.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/63929400627.pdfIn PDF document text
    • http://vkts.se/userfiles/file/balopozekoravawax.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/f9141be9029e3217e3c32d8f30839e81/ganofezosomisozor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=meterpreter+payload+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/zexijodesabaf.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_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 17548 bytes
SHA-256: ee7667a177ffbe0f804dcaa4f50abdf8185877c25b1ae058bf3584ac3694dcfb
font_01_sfnt_off00011031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 10232 bytes
SHA-256: 2a75c48c0998f9be9b6e8c9c1e9c5fc5a4a52e7355911ee20fb90b0cac767bd8